Low Temperature Physics Group

REFRIGERATOR:
A dilution refrigerator is a device that can achieve and maintain temperatures near 7 mK.
It can be divided into four main sections: ⁴He pot, still, heat exchangers and mixing chamber. A mixture of ⁴He and ³He gas is condensed into the fridge at the ⁴He pot, which is cooled to 1 K by evaporative cooling of ⁴He. The liquid helium mixture is pumped at the still which further cools the mixture to around 0.3 K, by evaporative cooling of ³He. Below 0.8 K the mixture of ⁴He and ³He phase separates into two phases: one is pure ³He and the other is ⁴He with a small quantity of ³He, the so-called dilute phase. The boundary between these two phases sits in the mixing chamber. As the still is pumped, differences in vapor pressure between the two isotopes leads to ³He being primarily removed from the dilute phase in the still. It is then energetically favorable for ³He in the pure side to move across the phase boundary to replenish the dilute side. This movement of ³He from the concentrated phase into the dilute phase is analogous to evaporation and has associated with it a latent heat. The ³He that is pumped off at the still is returned to the pure side of the mixing chamber by liquification at the ⁴He pot and is precooled through a series of heat exchangers in order to continue the cooling process.

SAMPLE REGION: CALORIMETER
Thermodynamic properties of superfluid ³He, such as specific heat, are measured in this experimental sample region. Specific heat measurement requires low and controlled heat capacity for materials other than the substance of interest, ³He in this case. Therefore, a superconducting cadmium heat switch is used to isolate the sample cell from the nulcear stage for the measurements. Also, low heat leak into ³He is crucial, and disconnecting the sample cell from the nuclear stage enables us to reduce the heat leak into ³He to as low as 80 pW. Once the sample is cooled to sub-mK, a standard adiabatic heat pulse technique is used to measure the heat capacity.

ADIABATIC NUCLEAR DEMAGNETIZATION:
In the nuclear stage a paramagnetic material, either Hitachi copper or praseodymium-nickel-5, is placed in an external magnetic field of ~8 T. With the field in place the nuclear spins in the paramagnetic material align parallel to the field. The field is then slowly (adiabatically) lowered to zero and the system of nuclear spins disorder from the low entropy (ordered) state into a configuration of higher entropy. This proccess absorbs heat and cools the ³He down to ~500 µK.

NMR SAMPLE REGION:
Using nuclear magnetic resonance (NMR) the spin state and spin dynamics of superfluid phases of ³He are studied in this sample region. This is, in fact, how the superfluid phases of ³He were discovered and identified at Cornell University in 1972. This discovery led to the Nobel Prize in Physics in 1996. Here at Northwestern we have studied the magnetization of superfluid ³He-B and NMR of superfluid ³He in aerogel.

PUBLICATIONS from Halperin: (as of April 2024)

261.	Planar Aerogel and Superfluid ³He, Structure and Transitions, J.W. Scott, M.D. Nguyen, D. Park and W. P. Halperin, J. Low. Temp. Phys. (2024), DOI: 10.1007/s10909-024-03069, arXiv: 2311.00909
260.	Orbital-flop Tranistion of Superfluid ³He in Anisotropic Silica Aerogel, M. D. Nguyen, J. S. Simon, J. W. Scott, A. M. Zimmerman, Y. C. Cincia Tsai, and W. P. Halperin, Nature Communications 15 201 (2024), DOI: 10.1038/s41467-023-44557-5, arXiv: 2301.11261
259.	Magnetic Susceptiblity of Andreev Bound States in Superfluid ³He-B, J. W. Scott, M. D. Nguyen, D. Park, and W. P. Halperin, Phys. Rev. Lett. 131, 046001 (2023), DOI: 10.1103/PhysRevLett.131.046001, arXiv: 2302.01258
258.	Axion Wind Detection with the Homogeneous Precession Domain of Superfluid Helium-3, Christina Gao, William Halperin, Yonatan Kahn, Man Nguyen, Jan Schutte-Engel, and John William Scott, Phys. Rev. Lett. 129, 211801 (2022), DOI: 10.1103/PhysRevLett.129.211801, arXiv: 2208.14454
257.	Contactless Excitation of Acoustic Resonance in Insulating Wafers, Gan Zhai, Yizhou Xin, Cameron J. Kopas, Ella Lachman, Mark Field, Josh Y. Mutus, Katarina Cicak, Jose Aumentado, Zuhawn Sung, and W. P. Halperin, Appl. Phys. Lett. 121, 142201 (2022), DOI: 10.1063/5.0116478, arXiv: 2207.11913
256.	Effects of the Order Parameter Anisotropy on the Vortex Lattice in UPT₃, K.E. Avers, W. J. Gannon, A. W. D. Leishman, L. Debeer-Schmitt, W. P. Halperin, and M. R. Eskildsen, Front. Electron. Matter. 2.878308 (2022), arXiv: 2202.08878
255.	Reversible ordering and disordering of the vortex lattice in UPT₃, K. E. Avers, S. J. Kuhn, A. W. D. Leishman, W. J. Gannon, L. Debeer-Schmitt, C. D. Dewhurst, D. Honecker, R. Cubitt, W. P. Halperin, and M. R. Eskildsen, Phys. Rev. B, 105, 184512 (2022), DOI: 10.1103/PhysRevB.105.184512, arXiv: 2103.09843
254.	Preface, Moses Chan & William P. Halperin, J. Low Temp. Phys. 205 155-157 (2021)
253.	RKKY Coupled Local-moment Magnetism in NaFe_1-xCu_xAs, Yizhou Xin, Ingrid Stolt, Yu Song, Pengcheng Dai, William P. Halperin, Phys. Rev. B 104, 144421, (2021), arXiv: 2107.04976
252.	The A-B transition in Superfluid ³He, W. P. Halperin, M. D. Nguyen, J. W. Scott, J. A. Sauls, J. Low Temp. Phys, (2021), DOI: 10.1007/s10909-021-02631-6, arXiv: 2108.04098
251.	Electron-beam Floating-zone Refined UCoGe, K. E. Avers, M. D. Nguyen, J. W. Scott, A. M. Zimmerman, S. M. Thomas, P. F. S. Rosa, E. D. Bauer, J. D. Thompson, and W. P. Halperin, Phys. Rev. Materials 5, 054803 (2021), DOI:10.1103/PhysRevMaterials.5.054803, arXiv: 2103.08000.
250.	Fingerprinting triangular-lattice antiferromagnet by excitation gaps, K. E. Avers, P. A. Maksimov, P. F. S. Rosa, S. M. Thomas, J. D. Thompson, W. P. Halperin, R. Movshovich, and A. L. Chernyshev, Phys. Rev. B 103, L180406 (2021), DOI:10.1103/PhysRevB.103.L180406, arXiv: 2102.02818.
249.	Broken Time-Reversal Symmetry in the Topological Superconductor UPt₃, K. E. Avers, W. J. Gannon, S.J. Kuhn, W.P. Halperin, J.A. Sauls, L. DeBeer-Schmitt, C.D. Dewhurst, J. Gavilano, G. Nagy, U. Gasser, and M.R. Eskildsen, Nature Physics, (2020), DOI: 10.1038/s41567-020-0822-z, arXiv: 1812.05690.
248.	Stripe Antiferromagnetism and Disorder in the Mott Insulator NaFe_1-xCu_xAs(x<0.5), Yizhou Xin, Ingrid Stolt, Yu Song, Pengcheng Dai, and W.P. Halperin, Phys. Rev. B 101, 064410 (2020), arXiv: 1908.07035
247.	The Effect of Magnetic Impurities on Superfluid ³He, A.M. Zimmerman, M.D. Nguyen, J.W. Scott, and W.P. Halperin, Phys. Rev. Lett. 124, 025302 (2020), arXiv: 1908:01739
246.	Toward the Mott State with Magnetic Cluster Formation in Heavily Cu-doped NaFe_1-xCu_xAs, Yizhou Xin, Ingrid Stolt, Jeongseop A. Lee, Yu Song, Pengcheng Dai, and W.P. Halperin, Phys. Rev. B 99, 155114 (2019), arXiv: 1903:12280
245.	Corrections to the Higgs Mode Masses in Superfluid ³He, M.D. Nguyen, A.M. Zimmerman and W.P. Halperin, Phys. Rev. B 99, 054510 (2019), arXiv: 1812.04545
244.	Orbital-Flop Transition of Angular Momentum in a Topological Superfluid, A.M. Zimmerman, J.I.A. Li, M.D. Nguyen, and W.P. Halperin, Phys. Rev. Lett. 121, 255303 (2018), arXiv: 1810.01901
243.	NMR Frequency Shifts and Phase Identification in Superfluid ³He. A.M. Zimmerman, M.D. Nguyen, and W.P. Halperin, J. Low Temp. Phys. (2019) 195:358, DOI:10.1007/s10909-018-2087-9, arXiv:1808.07943
242.	Location of the Oxygen dopant in high temperature superconductor HgBa₂CuO_4+x from ¹⁹⁹Hg NMR, Ingrid Stolt, Jeongseop A. Lee, A.M. Mounce, Yizhou Xin, and W. P. Halperin, Physica C: Superconductivity and its Applications 555, 24-27 (2018)
241.	Superfluid ³He in Aerogel, W. P. Halperin, Annual Reviews in Condensed Matter Physics Vol. 10:155-170, (2019), DOI: 10.1146/annurev-conmatphys-031218-01314, arXiv:1806.06437.
240.	Superfluid Helium-3 in confined quarters, W. P. Halperin, J. M. Parpia, and J. A. Sauls, Physics Today, 71, Nov. issue 11, 30 (2018).
239.	Superfluids and superconductors - an 80 year perspective, W.P. Halperin, Nature 553, 413-414 (2018).
238.	Spin Susceptibility of the Topological Superconductor UPt₃ from Polarized Neutron Diffraction, W. J. Gannon, W.P. Halperin, M.R. Eskildsen, Pengcheng Dai, U.B. Hansen, K. Lefmann, and A. Stunault, Phys. Rev. B 96, 041111(R) (2017).
237.	Recent Progress and New Challenges in Quantum Fluids and Solids, Y. Lee, W.P. Halperin, J. Low Temp. Phys. 189, 1-14 (2017).
236.	Magnetic Field Induced Vortex Lattice Transition in HgBa ₂CuO_4+x J. A. Lee, Y. Xin, I. Stolt, W.P. Halperin, A. P. Reyes, P. L. Kuhns, and M. K. Chan, Phys. Rev. B, 95, 024512 (2017).
235.	Coherent Charge and Spin Density Waves in Underdoped HgBa₂CuO_4+x J. A. Lee,Y. Xin, I. Stolt, W.P. Halperin, A. P. Reyes, P. L. Kuhns, and M. K. Chan, New Journal of Physics, 19, 033024 (2017).
234.	Superfluid Helium Caught Speeding, W.P. Halperin, Nature Physics 12, 993-993 (2016).
233.	Crystalization of ⁴He in Aerogel via Mass Flow through Surrounding Solid ⁴He, H. Matsuda, A. Ochi, R. Isozaki, S. Minami, R. Nomura, J. Pollanen, W.P. Halperin Y. Okuda, Phys. Rev. B 94, 024509 (2016).
232.	Persistence of Slow Fluctuations in the Overdoped Regime of Ba(Fe_1-xRH_x)₂As₂ Superconductors, L. Bossoni, M. Moroni, P.C. Canfield, W.P. Halperin, M. H. Julien, H. Mayaffre, A. Reyes, P. Carretta, Phys. Rev. B 93, 224517 (2016).
231.	Anisotropic phases of superfluid ³He in compressed aerogel, J.I.A. Li, A.M. Zimmerman, J. Pollanen, C.A. Collett, W.P. Halperin, Phys. Rev. Lett. 114, 105302 (2015).
230.	Temperature Dependence of the Magnetic Penetration Depth and Nodal Gap Structure of UPt₃ from Small Angle Neutron Scattering, W.J. Gannon, W.P. Halperin, C. Rastovski, K.J. Schlesinger, J. Hlevyack, C. Steiner, M.R. Eskildsen, A.B. Voronstov, J. Gavilano, U. Gasser, G. Nagy, New Journal of Physics 17, 023041 (2015).
229.	The impact of helium shortages on basic research, W.P. Halperin, Nature Physics 10, 467 (2014).
228.	Observation of broken time-reversal symmetry in the heavy-fermion superconductor UPt₃, E. R. Schemm, W. J. Gannon, C. Wishne, W. P. Halperin, Aharon Kapitulnik, Science 345, 190 (2014).
227.	Stability of superfluid ³He-B in compressed aerogel, J.I.A. Li, A.M. Zimmerman, J. Pollanen, C.A. Collett, W.J. Gannon, W.P. Halperin, Phys. Rev. Lett. 112, 115303 (2014).
226.	Dissipation signatures of the normal and superfluid phases in torsion pendulum experiments with ³He in aerogel, N. Zhelev, R.G. Bennett, E.N. Smith, J. Pollanen, W.P. Halperin, J.M. Parpia, submitted to Phys. Rev. B, arXiv:1308.4724 (2013).
225.	Enhanced self-diffusion of adsorbed methanol in silica aerogel, J.A. Lee, A.M. Mounce, S. Oh, A.M. Zimmerman, W.P. Halperin, Phys. Rev. B 90, 174501 (2014).
224.	Absence of Static Current-Loop Magnetism at the Apical Oxygen Site in HgBa₂CuO_4+δ from NMR, A.M. Mounce, Sangwon Oh, Jeongseop A. Lee, W.P. Halperin, A.P. Reyes, P.L. Kuhns, M.K. Chan, C. Dorow, L. Ji, D. Xia, X. Zhao, M. Greven, Phys. Rev. Lett. 111, 187003 (2013).
223.	Orientation of the Angular Momentum in Superfluid ³He-A in a Stretched Aerogel, J.I.A. Li, A.M. Zimmerman, J. Pollanen, C.A. Collett, W.J. Gannon, W.P. Halperin, J. Low Temp. Phys. 175, 31-36 (2014).
222.	The Superfluid Glass Phase of ³He-A, J.I.A. Li, J. Pollanen, A.M. Zimmerman, C.A. Collett, W.J. Gannon, W.P. Halperin, Nature Physics 9, 775-779 (2013).
221.	Evidence of unconventional low-frequency dynamics in the normal phase of Ba(Fe_1-xRh_x)₂As₂ iron-based superconductors, L. Bossoni, P. Carretta, W.P. Halperin, S. Oh, A. Reyes, P. Kuhns, P.C. Canfield, Phys. Rev. B 88 100503 (2013).
220.	Microscopic coexistence of a two-component incommensurate spin density wave with superconductivity in underdoped NaFe_0.983Co_0.017As, S. Oh, A.M. Mounce, J.A. Lee, W.P. Halperin, C.L. Zhang, S. Carr, P. Dai, A.P. Reyes, P.L. Kuhns, Phys. Rev. B 88, 134518 (2013).
219.	Spin pairing and penetration depth measurements from nuclear magnetic resonance in NaFe_0.975Co_0.025As, S. Oh, A.M. Mounce, J.A. Lee, W.P. Halperin, C.L. Zhang, S. Carr, P. Dai, Phys. Rev. B 87, 174517 (2013).
218.	Magnetic field dependence of spin-lattice relaxation in the s_± state of Ba_0.67K_0.33Fe₂As₂, S. Oh, A.M. Mounce, W.P. Halperin, C.L. Zhang, P. Dai, A.P. Reyes, and P.L. Kuhns, Phys. Rev. B 85, 174508 (2012).
217.	Zeeman Splitting and Nonlinear Field-Dependence in Superfluid ³He, C.A. Collett, J. Pollanen, J.I.A. Li, W.J. Gannon, and W.P. Halperin, J. Low Temp. Phys. 171, 214 (2013).
216.	Anisotropy of Silica Aerogels Induced by Small Strain, A.M. Zimmerman, M.G. Specht, D. Ginzburg, J. Pollanen, J.I.A. Li, C.A. Collett, W.J. Gannon, W.P. Halperin, J. Low Temp. Phys. 171, 745 (2013).
215.	Magnetization in the superconducting state of UPt₃ from polarized neutron diffraction, W.J. Gannon, W.P. Halperin, C. Rastovski, M.R. Eskildsen, Pengcheng Dai, and A. Stunault, Phys. Rev. B 86, 104510 (2012).
214.	Pressure Dependence of the Longitudinal Resonance Frequency of ³He Superfluid Phases in Aerogel, J.I.A. Li, J. Pollanen, C.A. Collett, W.J. Gannon, W.P. Halperin, J. Phys.: Conf. Ser. 400 012039 (2012).
213.	Nonlinear field dependence and f-wave interactions in superfluid ³He, C.A. Collett, J. Pollanen, J.I.A. Li, W.J. Gannon, W.P. Halperin, Phys. Rev. B 87, 024502 (2013).
212.	New chiral phases of superfluid ³He stabilized by anisotropic silica aerogel, J. Pollanen, J.I.A. Li, C.A. Collett, W.J. Gannon, W.P. Halperin and J.A. Sauls, Nature Physics 8, 317-320 (2012).
211.	Nuclear magnetic resonance studies of vortices in high temperature superconductors, A.M. Mounce, S. Oh, and W.P. Halperin, Frontiers of Physics, 6, 450-462 (2011).
210.	Modification of the ³He Phase Diagram by Anisotropic Disorder, R.G. Bennett, N. Zhelev, E.N. Smith, J. Pollanen, W.P. Halperin, J.M. Parpia, Phys. Rev. Lett. 107, 235504 (2011).
209.	Identification of Superfluid Phases of ³He in Uniformly Isotropic 98.2% Aerogel, J. Pollanen, J.I.A. Li, C.A. Collett, W.J. Gannon and W.P. Halperin, Phys. Rev. Lett. 107, 195301 (2011).
208.	Nanoparticle-Loaded Aerogels and Layered Aerogels Cast from Sol-Gel Mixtures, Jiwon Kim, Kideyuki Nakanishi, Johannes Pollanen, Stoyan Smoukov, William P. Halperin, and Bartosz A. Grzybowski, Small, 7, 2568-2572 (2011).
207.	⁷⁵As NMR of Ba(Fe_0.93Co_0.07)₂As₂ in high magnetic field, Sangwon Oh, A. M. Mounce, S. Mukhopadhyay, W. P. Halperin, A. B. Vorontsov, S. L. ko, P. C. Canfield, Y. Furukawa, A. P. Reyes, and P. L. Kuhns, Phys. Rev. B 83, 214501 (2011).
206.	Mass Coupling and Q^-1 of Impurity-Limited Normal ³He in a Torsion Pendulum, R.G. Bennett, N. Zhelev, A.D. Fefferman, K.Y. Fang, J. Pollanen, P. Sharma, W.P. Halperin and J.M. Parpia, J. Low Temp. Phys. 162, 174 (2011).
205.	Spin-density wave near the vortex cores in the high-temperature superconductor Bi₂Sr₂CaCu₂O_8+δ, A.M. Mounce, S. Oh, S. Mukhopadhyay, W.P. Halperin, A.P. Reyes, P.L. Kuhns, K. Fujita, M. Ishikado, S. Uchida, Phys. Rev. Lett. 106, 057003 (2011).
204.	Charge Induced Vortex Lattice Instability, A.M. Mounce, S. Oh, S. Mukhopadhyay, W.P. Halperin, A.P. Reyes, P.L. Kuhns, K. Fujita, M. Ishikado, S. Uchida, Nature Physics 7, 125 (2011).
203.	The Transition Between Real and Complex Superconducting Order Parameter Phases in UPt₃, J.D. Strand, D.J. Bahr, D.J. Van Harlingen, J.P. Davis, W.J. Gannon, W.P. Halperin, Science, 328 (5984), 1368 (2010).
202.	Evidence for Complex Superconducting Order Parameter Symmetry in the Low Temperature Phase of UPt₃ from Josephson Interferometry, J.D. Strand, D.J. Van Harlingen, J.B. Kycia, and W.P. Halperin, Phys. Rev. Lett., 103, 197002 (2009).
201.	Magnetic Impurities in the Pnictide Superconductor Ba_1-xK_xFe₂As₂, S. Mukhopadhyay, S. Oh, A.M. Mounce, M. Lee, W.P. Halperin, N. Ni, S.L. Bud'ko, P.C. Canfield, A.P. Reyes, and P.L. Kuhns, New J. Phys. 11, 055002 (2009).
200.	Impurity Effects of Aerogel in Superfluid ³He, W.P. Halperin, H. Choi, J.P. Davis and J. Pollanen, J. Phys. Soc. Jpn. 77 11, 111002 (2008).
199.	Low Temperature Thermal Resistance for a New Design of a Silver Sinter Heat Exchanger, J. Pollanen, H. Choi, J.P. Davis, B.T. Rolfs and W.P. Halperin, J. Phys.: Conf. Ser. 150 012037 (2009)
198.	Superfluid Phase Stability of ³He in Axially Anisotropic Aerogel, J. Pollanen, J.P. Davis, B. Reddy, K.R. Shirer, H. Choi and W.P. Halperin, J. Phys.: Conf. Ser. 150 032084 (2009).
197.	Anomalous Attenuation of Transverse Sound in ³He, J.P. Davis, J. Pollanen, H. Choi, J.A. Sauls, W.P. Halperin and A.B. Vorontsov, Phys. Rev. Lett. 101, 085301 (2008).
196.	High Frequency Sound in Superfluid ³He-B, J.P. Davis, H. Choi, J. Pollanen and W.P. Halperin, Journal of Low Temperature Physics 153, 1 (2008).
195.	Intrinsic Impurity in the High Temperature Superconductor Bi₂Sr₂CaCu₂O_8+d, Bo Chen, Sutirtha Mukhopadhyay, W.P. Halperin, Prasenjit Guptasarma, and D.G. Hinks, Phys. Rev. B 77, 052508 (2008).
194.	Globally Anisotropic High Porosity Silica Aerogels, J. Pollanen, K.R. Shirer, S. Blinstein, J.P. Davis, H. Choi, T.M. Lippman, L.B. Lurio, and W.P. Halperin, J. Non-Crystalline Solids 354, 4668 (2008).
193.	Discovery of a New Excited Pair State in Superfluid ³He, J.P. Davis, J. Pollanen, H. Choi, J.A. Sauls and W.P. Halperin, Nature Physics 4, 571-575 (2008).
192.	Magnetoresistance of UPt₃, T.M. Lippman, H. Choi, J.P. Davis, J. Pollanen, W.J. Gannon and W.P. Halperin, New J. of Physics 10, 043006 (2008).
191.	Stability of the Axial Phase of Superfluid ³He in Aerogel with Globally Anisotropic Scattering, J.P. Davis, J. Pollanen, B. Reddy, K.R. Shirer, H. Choi and W.P. Halperin, Phys. Rev. B 77, 140502(R) (2008).
190.	Magnetoacoustic Spectroscopy in Superfluid ³He-B, J.P. Davis, H. Choi, J. Pollanen, and W.P. Halperin, Phys. Rev. Lett. 100, 015301 (2008).
189.	Magnetoresistance of UPt₃, T.M. Lippman, J.P. Davis, H. Choi, J. Pollanen, and W.P. Halperin, J. Low Temp. Phys. 148, 863 (2007).
188.	Anisotropic Aerogels for Studying Superfluid ³He, J. Pollanen, S. Blinstein, H. Choi, J.P. Davis, T.M. Lippman, L.B. Lurio, and W.P. Halperin, J. Low Temp. Phys. 148, 579 (2007).
187.	Analysis of Strong-Coupling Parameters for Superfluid ³He, H. Choi, J.P. Davis, J. Pollanen, T.M. Haard, and W.P. Halperin, J. Low Temp. Phys. 148, 507 (2007).
186.	Imaginary Squashing Mode Spectroscopy of Helium Three B, J.P. Davis, H. Choi, J. Pollanen, and W.P. Halperin, J. Low Temp. Phys. 148, 501 (2007).
185.	Strong Coupling Corrections to the Ginzburg-Landau Theory of Superfluid ³He, H. Choi, J.P. Davis, J. Pollanen, T.M. Haard, and W.P. Halperin, Phys. Rev. B 75, 174503 (2007).
184.	Two-dimensional vortices in superconductors, Bo Chen and W. P. Halperin, et. al., Nature Physics 3 239 (2007)
183.	Penetration depth and anisotropy of MgB₂ from ¹¹B NMR, Bo Chen, Pratim Sengupta, Eric E. Sigmund, and W. P. Halperin, et, al., New Journal of Physics 8 274 (2006).
182.	Focus on Correlated Electrons, Magnetism and Superconductivity in High Magnetic Fields, W. P. Halperin, A.H. Lacerda, and N. Miura, New J. Phys. 8 (2006).
181.	Collective Modes and f-Wave Pairing Interactions in Superfluid ³He, J.P. Davis, H. Choi, J. Pollanen, and W.P. Halperin, Phys. Rev. Lett. 97 115301 (2006).
180.	The Stokes-Einstein Relation in Supercooled Aqueous Solutions of Glycerol, Bo Chen, E.E. Sigmund, and W.P. Halperin, Phys. Rev. Lett. 96, 145502 (2006).
179.	Surface Specific Heat and Andreev Bound States, H. Choi, J.P. Davis, J. Pollanen, and W.P. Halperin, Phys. Rev. Lett. 96, 125301 (2006).
178.	Specific Heat of Disordered ³He, AIP Proceedings, H. Choi, J.P. Davis, J. Pollanen, N. Mulders, W.P. Halperin, AIP Conf. Proc. 850, 241 (2006).
177.	Acoustic Spectroscopy of Superfluid ³He in Aerogel, J.P. Davis, H. Choi, J. Pollanen, W.P. Halperin, AIP Conf. Proc. 850, 239 (2006).
176.	Compressed Silica Aerogels for the Study of Superfluid ³He in Aerogel, J. Pollanen, H. Choi, J.P. Davis, S. Blinstein, T.M. Lippman, L.B. Lurio, N. Mulders, W.P. Halperin, AIP Conf. Proc. 850, 237 (2006).
175.	The AB Transition of Superfluid in Aerogel and the Effect of Anisotropic Scattering, C.L. Vicente, H.C. Choi, J.S. Xia, W.P. Halperin, N. Mulders, and Y. Lee, Phys. Rev. B 72, 094519 (2005).
174.	Effect of Strong Magnetic Fields on Superfluid ³He in 98% Porosity Aerogel, H.C. Choi, A.J. Gray, C.L. Vicente, J.S. Xia, G. Gervais, W.P. Halperin, N. Mulders, and Y. Lee, J. Low Temp. Phys. 138, 107 (2004).
173.	The A₁ and A₂ Transitions in Superfluid ³He in 98% Porosity Aerogel, H.C. Choi, A.J. Gray, C.L. Vicente, J.S. Xia, G. Gervais, W.P. Halperin, N. Mulders, and Y. Lee, Phys. Rev. Lett. 93, 145302 (2004).
172.	Specific Heat of Disordered Superfluid ³He, H. Choi, K. Yawata, T.M. Haard, J.P. Davis, G. Gervais, N. Mulders, P. Sharma, J.A. Sauls, and W.P. Halperin, Phys. Rev. Lett. 93, 145301(2004).
171.	Helium-Three in Aerogel, W.P. Halperin and J.A. Sauls, Physics Today, submitted (2004).
170.	Crossover Behavior and Dynamical Heterogeneity in the Diffusion of Glass-formers, E. E. Sigmund and W. P. Halperin, J. Chem. Phys. submitted (2003).
169.	Hole-burning Diffusion Measurements in High Magnetic Field Gradients, E. E. Sigmund and W. P. Halperin, J. Mag. Res. 163, 99 (2003).
168.	Alkali Ion-Cryptand Interactions and Their Effects on Electrolyte Conductivity, Z. Ding, D.E. Ellis, R.E.A. Dillon, D.F. Shriver, E.E. Sigmund, and W.P. Halperin, Phys. Chem. Chem. Phys. 5, 2072 (2003).
167.	Low Field DC SQUID Nuclear Magnetic Resonance on Single Crystal UPt₃, R. Korber, A. Casey, M.E. Digby, Junyun Li, J. Luo, C.P. Lusher, J. Saunders, D. Drung, T. Schurig, J.B. Kycia, J.I. Hong, D.N. Seidman, and W.P. Halperin, Physica C 388, 523 (2003).
166.	Impurity Phases of Superfluid ³He in Aerogel, W.P. Halperin, G. Gervais, K. Yawata, and N. Mulders, Physica B 329, 288 (2003).
165.	NMR Lineshape in the Vortex Lattice State of Near-Optimally Doped YBa₂Cu₃O_7-d, V. F. Mitrovic, E. E. Sigmund, and W.P. Halperin, Physica C 388-389, 629 (2003).
164.	Loss of Memory in ‘Dirty’ Superfluid ³He, G. Gervais, K. Yawata, N. Mulders, and W.P. Halperin, Physica B 329, 329 (2003).
163.	Heat Capacity of ³He in Aerogel, K. Yawata, T.M. Haard, N. Mulders, G. Gervais, and W. P. Halperin, Physica B 329, 327 (2003).
162.	Reply: Gervais, Yawata, and Halperin, G. Gervais, K. Yawata, and W. P. Halperin, Phys. Rev. Lett. 88, 209602 (2002).
161.	Phase Diagram of the Superfluid Phases of ³He in 98 % Aerogel, G. Gervais, K. Yawata, N. Mulders, W.P. Halperin, Phys. Rev. B 66, 054528 (2002).
160.	Antiferromagnetism in the Vortex Cores of YBa₂Cu₃O_7-d, V. F. Mitrovic, E. E. Sigmund, W.P. Halperin, A.P. Reyes, P. Kuhns, W.G. Moulton, Phys. Rev B. Rapid 67, 220503 (2003).
159.	The Pseudogap in YBa₂Cu₃O_7-d from NMR in High Magnetic Fields, V. F. Mitrovic, H. N. Bachman, W.P. Halperin, A.P. Reyes, P. Kuhns, W.G. Moulton, Phys. Rev. B. 66, 014511 (2002).
158.	Inductive Shielding of NMR Phase Noise, E.E. Sigmund, V.F. Mitrovic, E.S. Calder, G.W. Thomas, H.N. Bachman, W.P. Halperin, P.L. Kuhns, and A.P. Reyes, J. Mag. Res. 159, 190 (2002).
157.	Anomalous Behavior of Spin Fluctuations in Polycrystalline NdBa₂Cu₃O₇, A.P. Reyes, M. Abdelrazek, P.L. Kuhns, W.G. Moulton, W.P. Halperin, and K. Kishio, Int. J. of Mod. Phys. 16, 3164 (2002).
156.	Nucleation and interfacial coupling between pure and dirty superfluid phases of ³He, G. Gervais, K. Yawata, N. Mulders, W.P. Halperin, Phys. Rev. Lett. 88, 045505 (2002).
155.	Modification of the Superfluid ³He Phase Diagram by Impurity Scattering, G. Gervais, R. Nomura, T.M. Haard, N. Mulders, W.P. Halperin, Phys. Rev. Lett. 87, 035701 (2001).
154.	Progressive Saturation NMR Relaxation , V. F. Mitrovic, E.E. Sigmund, and W.P. Halperin, Phys. Rev. B 64, 024520 (2001).
153.	Lithium Transport in a Novel Macrocyclic Electrolyte, E.E. Sigmund, and W.P. Halperin, R.E.A. Dillon, and D.F. Shriver, Phys. Rev. B 64, 214201 (2001).
152.	Spatially Resolved Electronic Structure Inside and Outside the Vortex Core of a High Temperature Superconductor, V. F. Mitrovic, E. E. Sigmund, M. Eschrig, H. N. Bachman, W.P. Halperin, A.P. Reyes, P. Kuhns, and W.G. Moulton, Nature 413, 501 (2001).
151.	Acoustics of a ‘Dirty’ Fermi Liquid: ³He in Aerogel, G. Gervais, R. Nomura, T.M. Haard, Y. Lee, N. Mulders, and W.P. Halperin, J. of Low Temp. Phys. 122, 1 (2001).
150.	Polar Signal Averaging, G.W. Thomas, H.N. Bachman, E.E. Sigmund, V.F. Mitrovic, E.S. Calder, and W.P. Halperin, Concepts in Mag. Res. 14, 359 (2002).
149.	NMR Phase Noise in Bitter Magnets, E.E. Sigmund, E.S. Calder, G.W. Thomas, V.F. Mitrovic, H.N. Bachman, W.P. Halperin, P.L. Kuhns, and A.P. Reyes, J. Mag. Res. 148, 309 (2001).
148.	Crystal Structure Assignment for the Heavy-Fermion Superconductor UPt₃, D.A. Walko, J.-I. Hong, T.V. Chandrasekhar Rao, Z. Wawrzak, D.N. Seidman, W.P. Halperin, and M.J. Bedzyk, Phys. Rev. B 63, 54522 (2001).
147.	High-Frequency Acoustics of ³He in Aerogel, R. Nomura, G. Gervais, T.M. Haard, Y. Lee, N. Mulders, W.P. Halperin, Phys. Rev. Lett. 85, 4325 (2000).
146.	^63,65Cu Nuclear Quadrupole Resonance Study of Ni-doped YBa₂Cu₃O₇, Moohee Lee, W.P. Halperin, and K.R. Poeppelmeier, Physica C 329, 185 (2000).
145.	Magnetic Study of the UPt₃ Superconducting Phases, Stephan Schottl, Erwin A. Schuberth, Jan B. Kycia, and William P. Halperin, Physica B 280, 174 (2000).
144.	Low Frequency Broadband NMR on UPt₃ using DC SQUIDs, Junyun Li, M. Digby, A. Casey, C. Lusher, B. Cowan, J. Saunders, D. Drung, T. Schurig, J.B. Kycia, J.I. Hong, D.N. Seidman, and W.P. Halperin, Physica B 284, 2107 (2000).
143.	Magneto-Acoustic Rotation of Transverse Waves in ³He-B, J.A. Sauls, Y. Lee, T. Haard,, and W.P. Halperin, Physica B 284, 267 (2000).
142.	Acoustic Faraday Effect in Superfluid ³He-B, Y. Lee, T. Haard, J. A. Sauls, and W. P. Halperin, Physica B 280, 106 (2000).
141.	The Pathlength Distribution of Simulated Aerogels, T.M. Haard, G. Gervais, R. Nomura, and W.P. Halperin, Physica B 284, 289 (2000).
140.	Discovery of the Acoustic Faraday Effect in Superfluid ³He-B, Y.Lee, T. Haard, W. P. Halperin, and J.A. Sauls, Nature, 400, 431 (1999).
139.	New Evidence for Unconventional Superconductivity in UPt₃ from Magnetic Torque Studies, S. Schöttl, E.A. Schuberth, K. Flachbart, J.B. Kycia, W.P. Halperin, A.A. Menovsky, E. Bucher, and J. Hufnagl, Phys. Rev. B 62, 4124 (2000).
138.	Anisotropic DC Magnetization of Superconducting UPt₃ and Antiferromagnetic Ordering Below 20 mK, S. Schöttl, E.A. Schuberth, K. Flachbart , J.B. Kycia, J.I. Hong, D.N. Seidman, W.P. Halperin, J. Hufnagl, and E. Bucher, Phys. Rev. Lett. 82, 2378 (1999).
137.	Superconducting Fluctuation Effects on the Spin-lattice Relaxation Rate in YBa₂Cu₃O_6.95, V.F. Mitrovic, H.N. Bachman, W.P. Halperin, M. Eschrig, J.A. Sauls, A.P. Reyes, P. Kuhns, and W.G. Moulton, Phys. Rev. Lett. 82, 2784 (1999).
136.	Superconducting Fluctuation Effects on the Electron Spin Susceptibility in YBa₂Cu₃O₇, H. N. Bachman, V. F. Mitrovic, A. P. Reyes, W. P. Halperin, M. Eschrig, J. A. Sauls, A. Kleinhammes, P. Kuhns, and W. G. Moulton, Phys. Rev. B 60, 7591 (1999).
135.	Neutron Diffraction Study of Cement, M.P. Fang, P.E. Sokol, J.Y. Jehng, and W.P. Halperin, Journal of Porous Materials 6, 95 (1999).
134.	Processing Facility for the Preparation of High Quality Crystals of Heavy Fermion and Intermetallic Compounds, B. M. Davis, J. B. Kycia, J. I. Hong, D. N. Seidman, and W. P. Halperin, Reviews of Scientific Instruments, (submitted)
133.	Suppression of Superconductivity in UPt₃ Single Crystals, J.B. Kycia, J.I. Hong, M.J. Graf, J.A. Sauls, D.N. Seidman, and W.P. Halperin, Phys. Rev. B 58, R603 (1998).
132.	High Field Vortex Phase Diagram of YBa₂Cu₃O₇ from ¹⁷O NMR, H.N. Bachman, A.P. Reyes, V.F. Mitrovic, W.P. Halperin, A. Kleinhammes, P. Kuhns, and W.G. Moulton, Phys. Rev. Lett. 80, 1726 (1998).
131.	Pore Structure Evolution and State of Pore Water in Hydrating Cement Paste at Cryogenic Temperatures, J.-Y Jehng, D.T. Sprague, S. Bhattacharja, and W.P. Halperin, Proccedings of the Fifth Int. Conf. on Space'96, ed. S.W. Johnson, Albuquerque NM, American Society of Civil Engineers 1, 600-607 (1996).
130.	Versatile 4K Probe and Cryogenic System for Small Bore High-Field-Bitter Magnets, A.P. Reyes, H.N. Bachman, and W.P. Halperin, Rev. of Sci. Instr. 68, 2132 (1997).
129.	NMR Study of Naturally Occurring ¹³C in the Haldane Gap Material Ni(C₂H₈N₂)₂NO₂ClO₄, A.P. Reyes, H.N. Bachman, X.P. Tang, M.W. Meisel, W.P. Halperin, N. Fujiwara, and T. Goto, Phys. Rev. B 55, 8079 (1997).
128.	Effect of Magnetic Scattering on the ³He Superfluid State in Aerogel, D.T. Sprague, T.M. Haard, J.B. Kycia, M.R. Rand, Y. Lee, P.J. Hamot, and W.P. Halperin, Phys. Rev. Lett. 77, 4568 (1996).
127.	Vortex melting in Polycrystalline YBa₂Cu₃O₇ from ¹⁷O NMR, A.P. Reyes, X.P. Tang, H.N. Bachman, W.P. Halperin, J.A. Martindale, and P.C. Hammel, Phys. Rev. B 55, R14737 (1997).
126.	High Frequency Acoustic Measurements in Liquid ³He Near the Transition Temperature, Y. Lee, P.J. Hamot, M.W. Meisel, D.T. Sprague, T.M. Haard, J.B. Kycia, M.R. Rand, and W.P. Halperin, J. Low Temp. Phys. 103, 265 (1996).
125.	UPt₃ Crystal Growth and Characterization, J.B. Kycia, B.M. Davis, J.I. Hong, D.N. Seidman, and W.P.Halperin, Czechoslovak Journal of Physics 46 775 (1996).
124.	Magnetic Field Suppression of ³He Superfluidity in Aerogel, D.T. Sprague, T.M. Haard, J.B. Kycia, M.R. Rand, Y. Lee, and W.P. Halperin, Czechoslovak Journal of Physics 46, 119 (1996).
123.	NMR on Superfluid ³He in Aerogel, W.P. Halperin, D.T. Sprague, T.M. Haard, J.B. Kycia, Y. Lee, and M.R. Rand, Czechoslovak Journal of Physics 46, 2989 (1996).
122.	High Resolution Sound Velocity Measurements in Liquid ³He Using Path Length Modulation Technique, Y. Lee, P.J. Hamot, D.T. Sprague, T.M. Haard, J.B. Kycia, M.R. Rand, and W.P. Halperin, Czechoslovak Journal of Physics 46, 59 (1996).
121.	⁶³Cu NMR in Heavily Doped La₂CuO₄, Y.-Q. Song, A.P. Reyes, X.P. Tang, W.P. Halperin, and D. Hinks, J. Phys. Chem. Solids 56, 1939 (1995).
120.	Nonlinear Spin Dynamics and Magnetic Field Distortion of the Superfluid ³He-B Order Parameter, M.R. Rand, D.T. Sprague, T.M. Haard, J.B. Kycia, H.H. Hensley, Y. Lee, P.J. Hamot, D.M. Marks, W.P. Halperin, T. Mizusaki and T. Ohmi, Phys. Rev. Lett. 77, 1314 (1996).
119.	Pore Structure of Hydrating Cement Paste by Magnetic Resonance Relaxation Analysis and Freezing, J.Y. Jehng, D.T. Sprague, and W.P. Halperin, Magnetic Resonance Imaging 14, 785 (1996).
118.	The Growth and Characterization of High Quality UPt₃ Crystals, J.B. Kycia, B.M. Davis, J.I. Hong, M.W. Meisel, D.N. Seidman, and W.P. Halperin, Jour. Low Temp. Phys. 101, 623 (1995).
117.	Nuclear Magnetic Resonance of ³He Superfluid Confined in High Porosity Aerogel, D.T. Sprague, T.M. Haard, J.B. Kycia, M.R. Rand, Y. Lee, P.J. Hamot and W.P. Halperin, Jour. Low Temp. Phys. 101, 185 (1995).
116.	Homogeneous Equal-Spin Pairing Superfluid State of ³He in Aerogel, D.T. Sprague, T.M. Haard, J.B. Kycia, M.R. Rand, Y. Lee, P.J. Hamot and W.P. Halperin, Phys. Rev. Lett. 75, 661 (1995).
115.	First- and Zero-sound Velocity and Fermi Liquid Parameter F₂^s in Liquid ³He Determined by a Path Length Modulation Technique, P.J. Hamot, Y. Lee, D.T. Sprague, T.M. Haard, J.B. Kycia, M.R. Rand, and W.P. Halperin, Jour. Low Temp. Phys. 99, 651 (1995).
114.	Monte Carlo Study of Magnetic Properties of a Cu_1-xNi_x(pc)I Spin Chain, Q. Chen, D.E. Ellis, Y. Lee, W.P. Halperin, J.A. Thompson, B.M. Hoffman, J. Magn. Magn. Mat. 152, 139-151 (1996).
113.	Dimensionality Crossover in the Transport Behavior of the Quasi-One Dimensional Conductor H₂(pc)I, Y. Lee, H. H. Hensley, J. A. Thompson, K. Murata, B. M. Hoffman, T.M. Haard, P. J. Hamot, W. P. Halperin, and P. Wölfle, Eur. Phys. Lett. 36, 681 (1996).
112.	Experimental Determination of the ³He-B g-shift Pressure Dependence, T.M. Haard, J.B. Kycia, M.R. Rand, H.H. Hensley, G.F. Moores, Y. Lee, P.J. Hamot, W.P. Halperin, and E. Thuneberg, Physica B 194-196, 751 (1994).
111.	Abrupt Dimensional Crossover in the Quasi-One Dimensional Conductor, H₂(pc)I, Y. Lee, H.H. Henseley, T.M. Haard, P.J. Hamot, W.P. Halperin, J.A. Thompson, and B.M. Hoffman, Physica B 194-196, 1263 (1994).
110.	New NMR Evidence: Can an Axi-planar ³He-A Order Parameter be Ruled Out?, M.R. Rand, H.H. Hensley, J.B. Kycia, T.M. Haard, Y. Lee, P.J. Hamot, and W.P. Halperin, Physica B 194-196, 805 (1994).
109.	Pulsed NMR in Superfluid ³He-B, H.H. Hensley, M.R. Rand, T.M. Haard, J.B. Kycia, P.J. Hamot, Y. Lee, G. Moores, and W.P.Halperin, Physica B 194-196, 829 (1994).
108.	Low Temperature Vortex Dynamics in a High Temperature Superconductor, Y.-Q. Song, S. Tripp, W.P. Halperin, L. Tonge and T.J. Marks, Phys. Rev. B 50, 16570 (1994).
107.	Application of Spin-Spin Relaxation to Measurement of Surface Area and Pore Size Distributions in a Hydrating Cement Paste, W.P. Halperin, J.-Y. Jehng, and Y.-Q. Song, Magnetic Resonance Imaging 12, 169 (1994).
106.	Surface Magnetic Relaxation in Cement Pastes, K.S. Mendelson, W.P. Halperin, J.-Y. Jehng, and Y.-Q. Song, Magnetic Resonance Imaging, 12, 207 (1994).
105.	High Resolution Nuclear Magnetic Resonance of Superfluid ³He-B, J.B. Kycia, T.M. Haard, M.R. Rand, H.H. Hensley, G.F. Moores, Y. Lee, P.J. Hamot, D.T. Sprague, W.P. Halperin and E.V. Thuneberg, Phys. Rev. Lett. 72, 864 (1994).
104.	High Resolution Measurements of the Larmor Frequency in Normal-Liquid ³He, T.M. Haard, J.B. Kycia, M.R. Rand, H.H. Hensley, Y. Lee, P.J. Hamot, D.T. Sprague and W.P. Halperin, Phys. Rev. Lett. 72, 860 (1994).
103.	Low Temperature Fluctuations of Vortices in Layered Superconductors, Y.-Q. Song, W.P. Halperin, L. Tonge, T.J. Marks, M. Ledvij, V. Kogan, and L.N. Bulaevskii, Phys. Rev. Lett. 70, 3127 (1993).
102.	Song et al. reply to comment on, “Low Temperature Fluctuations of Vortices in Layered Superconductors”, Phys. Rev. Lett. 72, 177 (1994).
101.	¹⁹⁵Pt Spin Dynamics and Knight Shift in Single Crystals of UPt₃, M. Lee, G. Moores, Y.-Q. Song, W.P. Halperin, W.W. Kim, and G.R. Stewart, Phys. Rev. B 48, 7392 (1993).
100.	Surface Spin Diffusion in Platinum Nanometer-sized Crystals, I. Yu and W.P. Halperin, Phys. Rev. B 47, 15830 (1993).
99.	Microstructure Determination of Cement Pastes by NMR and Conventional Technqiues, Sankar Bhattacharja, Mosongo Maoukwa, Franco D'Orazio, Jyh-Yuar Jehng, and W.P. Halperin, Advanced Cement Based Materials 1, 67 (1993).
98.	Spin Susceptibility in the La_2-xSr_xCuO₄ System from Underdoped to Overdoped Regimes, Y.Q. Song, M.A. Kennard, K.R. Poeppelmeier, and W.P. Halperin, Phys. Rev. Lett. 70, 3131 (1993).
97.	Magnetic Susceptibility Anisotropy of Grain Aligned Oxygen Deficient YBa₂Cu₃O₇, M. Lee, N. Tea, Y.-Q Song, W.P. Halperin, J. Thiel, M.A. Kennard, K.R. Poeppelmeier, M.M. Fang, and U. Welp, Physica C 201, 95 (1992).
96.	Measurement of the g-Shift in Superfluid ³He-B, H.H. Hensley, G.F. Moores, M.R. Rand, T.M. Haard, J.B. Kycia, P. Hamot, Y. Lee, and W.P. Halperin, J. Low Temp. Phys. 89, 505 (1992).
95.	Accurate Determination of the Landau Parameter F_o^a for ³He, H.H. Hensley, Y. Lee, P. Hamot, T. Mizusaki, and W.P. Halperin, J. Low Temp. Phys. 89, 501, (1992).
94.	Measurements of the Magnetic Susceptibility of Normal Fluid ³He at Very Low Temperatures, H.H. Hensley, Y. Lee, P. Hamot, T. Mizusaki, and W.P. Halperin, J. Low Temp. Phys. 90, 149 (1993).
93.	Electronic Spin Susceptibility in Superconducting YBa₂Cu₃O₇ From Nuclear Spin-Spin Coupling, Y.-Q. Song and W.P. Halperin, Physica C 191, 131 (1992).
92.	Determination of Magnetic Penetration Depth from Saddle Point Field Analysis in Tl₂Ba₂Ca₂Cu₁₃O_10+d, Y.-Q. Song, M. Lee, W.P. Halperin, L.M. Tonge, and T.J. Marks, Phys. Rev. B 45, 4945 (1992).
91.	Magnetic Flux Lattice Anisotropy of Tl₂Ba₂Ca₂Cu₃O_10+d by ²⁰⁵Tl Nuclear Magnetic Resonance, Y.-Q. Song, M. Lee, W.P. Halperin, L.M. Tonge, and T.J. Marks, Phys. Rev. B 44, 914 (1991).
90.	Local Symmetry of Copper Sites in La_2-xSr_xCuO₄, Y.-Q. Song, M.A. Kennard, M. Lee, K.R. Poeppelmeier, and W.P. Halperin, Phys. Rev. B. 44, 7159 (1991).
89.	Two Electronically Distinct Copper Sites in La_2-xSr_xCuO_4-d Compounds for 0.10<x<0.20, M.A. Kennard, Y.-Q. Song, K.R. Poeppelmeier, and W.P. Halperin, Chemistry of Materials 3, 672, (1991).
88.	High Resolution Acoustic Measurements by Path Length Modulation, P.J. Hamot, H.H. Hensley, Y. Lee, and W.P. Halperin, Physica B 165&166 127 (1990).
87.	Korringa Behavior for Cu(2) in YBa₂Cu₃O_6.98, Y.-Q. Song, M. Lee, N. Tea, F. D'Orazio, S. Bhattacharja, W.P. Halperin, J.P. Thiel, K.R. Poeppelmeier, U. Welp, G. Crabtree, and M.M. Fang, Physica B 165&166 1301 (1990).
86.	Relaxation and Dynamical Properties of Water in Partially Filled Porous Materials Using NMR Techniques, W.P. Halperin, S. Bhattacharja, and F.D'Orazio, Magnetic Resonance Imaging 9, 733 (1991).
85.	Molecular Diffusion and Nuclear Magnetic Resonance Relaxation in Unsaturated Porous Silica Glass, F.D'Orazio, S. Bhattacharja, W.P. Halperin, K. Eguchi, and T. Mizusaki, Phys. Rev. B 42, 9810 (1990).
84.	Fluid Transport in Partially Filled Porous Sol-gel Silica Glass, F.D'Orazio, S. Bhattacharja, W.P. Halperin, and R. Gerhardt, Phys. Rev. B 42, 6503 (1990).
83.	Thallium Magnetic Resonance in Superconducting Tl₂Ba₂Ca₂Cu₃O_10+d, M. Lee, Y.-Q.Song, W.P. Halperin, L.M. Tonge, T.J. Marks, H.O. Marcy and C.R. Kannewurf, Phys. Rev. B 40, 817 (1989).
82.	Cu(tatbp)I and [Cu(tatbp)]₃[ReO₄]₂*(C₁₀H₇Cl): Long Range Cu-Cu Couplings in Quasi One-dimensional Molecular Metals, M.R. Godfrey, K. Liou, T. Newcomb, W.P. Halperin, B. Hoffman, and J.A. Ibers, Synthetic Metals 29, F51 (1989).
81.	Microwave Absorption of Aligned Crystalline Grains of YBa₂Cu₃O_7-x, M. Poirier, G. Quirion, and B. Quirion, F. D'Orazio, J. P. Thiel, W.P. Halperin, and K.R. Poeppelmeier, J. Appl. Phys. 66, 1261 (1989).
80.	Internal Structure of Porous Silica: Characterization by Nuclear Magnetic Resonance, S. Bhattacharja, F. D'Orazio, J. C. Tarczon, W.P. Halperin, and R. Gerhardt, J. Am. Ceram. Soc. 72, 2126 (1989).
79.	Application of Nuclear Magnetic Resonance Pore Stucture Analysis to Porous Slica Glass, F.D'Orazio, J.C. Tarczon, W.P. Halperin, K. Eguchi, and T. Mizusaki, J. Appl. Phys. 65, 742, (1989).
78.	Self-Diffusion and Ionic Transport in PPO-LiSO₃CF₃, S.E. Lindsey, D.H. Whitmore, W.P. Halperin, and J.M. Torkelson, Polymer Preprints, Amer. Chem. Soc. 30, 442 (1989).
77.	Enhanced Self-Diffusion of Water in Restricted Geometry, F. D'Orazio, S. Bhattacharja, W.P. Halperin, and R. Gerhardt, Phys. Rev. Lett. 63, 43 (1989).
76.	Preparation, Characterization, and Low Temperature Transition of Cu(tatbp)I, a New Porphyrinic Conductor with Local Moments Coupled to Itinerant Charge Carriers, K. Liou, M.Y. Ogawa, T.P. Newcomb, G. Quirion, M. Lee, M. Poirier, B.M. Hoffman, J. Ibers, and W.P. Halperin, Inorg. Chem. 28, 3889 (1989).
75.	Order Parameter Collective Modes in Superfluid ³He, W.P. Halperin and E. Varoquaux, in Helium Three, Modern Problems in Condensed Matter Physics, edited by W.P. Halperin and L. Pitaevskii, North Holland, Amsterdam. Ch. 7, pp 353-522 (1990).
74.	High Resolution Phase Velocity Measurements in a Short Path Length Acoustical Cavity, P.J. Hamot, H.H. Hensley, and W.P. Halperin, J. Low Temp. Phys. 77, 429 (1989).
73.	Magnetic Resonance Relaxation Analysis of Porous Media, W.P. Halperin, F. D'Orazio, S. Bhattacharja, and J.C. Tarczon, in Molecular Dynamics in Restricted Geometries edited by J. Klafter and J.M. Drake, John Wiley and Sons, New York. Ch. 11, p. 311 (1989).
72.	NMR and Quantum effects in Metal Particles, W.P. Halperin, and I. Yu, Proc. of the Mat. Res. Soc. 111,79 (1988).
71.	Vacancy-Antistructure Defect Interaction Diffusion in b-LiAl and b-LiIn, J.C. Tarczon, W.P. Halperin, S.C. Chen, J.O. Brittain, Materials Sci. and Eng. A 101, 99 (1988).
70.	Evidence for a One-Dimensional Indirect Interaction Between Localized Moments in Copper Phthalocyanine Iodide Mediated by Itinerant Electrons, M.Y. Ogawa, S. Liu, B.M. Hoffman, M. Lee, S. Lee, M. Yudkowsky, M. Lovellette, and W.P. Halperin, J. Jour. Appl. Phys. 26, 841 (1987).
69.	Spin Lattice Relaxation in the Normal and Superconducting States of a High T_c Superconductor, M. Lee, M. Yudkowsky, W.P. Halperin, J. Thiel, S.-J. Hwu, and K.R. Poeppelmeier, J. Jour. Appl. Phys. 26, 1019 (1987).
68.	Energy Gap and Korringa Constant in the High Temperature Superconductor La_1.83Sr_0.17CuO₄ determined by NMR, M. Lee, M. Yudkowsky, W.P. Halperin, , J.Thiel, S.-J. Hwu, and K.R. Poeppelmeier, Phys. Rev. B 36, 2378 (1987).
67.	Alterations in Magnetic Characteristics Produced by Intracellular Particles, R.T. Gordon, W.P. Halperin, D. Gordon, and A.J. Freeman, J. Biological Physics 14, 77 (1986).
66.	Magnetic Transitions in a Molecular Metal with Embedded Local Moments: Cu(pc)I, M.Y. Ogawa, S.M. Palmer, J. Martinsen, J.L. Stanton, B.M. Hoffman, J.A. Ibers, S. Lee, M. Yudkowsky, and W.P. Halperin, Synth. Metals 19, 781 (1987).
65.	One-dimensional Magnetism in Copper Phthalocyanine, S. Lee, M. Yudkowsky, W.P. Halperin, M.Y. Ogawa, and B.M. Hoffman, Phys. Rev. B 35, 5003 (1987).
64.	Strongly polarized ³He: Polarizability and Sound Velocity, G. Bonfait, L. Puech, W.P. Halperin, and B. Castaing, Can. J. of Phys. 65, 1426 (1987).
63.	Sound Velocity in Highly Polarized ³He, G. Bonfait, L. Puech, W.P. Halperin, and B. Castaing, Europhys. Lett. 3, 489 (1987).
62.	Transition of Local Moments Coupled to Itinerant Electrons in the Quasi-one Dimensional Conductor: Cu(pc)I, M.Y. Ogawa, B.M. Hoffman, S. Lee, M. Yudkowsky, and W.P. Halperin, Phys. Rev. Lett. 57, 1177 (1986).
61.	Molecular Diffusion in Porous Materials, J.C. Tarczon, A.H. Thompson, W.A. Ellingson, and W.P. Halperin, in Transport and Relaxation in Random Materials, ed J. Klafter, R.J. Rubin, and M.F. Shlesinger, World Scientific, Singapore, p72-85 (1986).
60.	Quantum Size Effects in Metallic Powders, W.P. Halperin, Rev. Mod. Phys. 58, 533 (1986).
59.	Sound Propagation Experiments in a Magnetic Field in Superfluid ³He-B, B.S. Shivaram, M.W. Meisel, B.K. Sarma, W.P. Halperin, and J.B. Ketterson, J. Low Temp. Phys. 63, 57 (1986).
58.	Influence of Stoichiometry and the Nature of the Spinel-Block Stabilizing Elements on Proton Transport in Solid Electrolytes with the b" Alumina structure, S.W. Smoot, W.P. Halperin, and D.H. Whitmore, Solid State Ionics 18-19, 687 (1986).
57.	Magnetic Field Investigation of the Acoustic Impedance Resonance Near 2D(T) in ³He-A, M.W. Meisel, B.S. Shivaram, B.K. Sarma, J.B. Ketterson, and W.P. Halperin, Phys. Lett. A 110, 49 (1985).
56.	Atomic Transport Properties of Intermetallic Compounds b-LiAl and b-LiIn, S.C. Chen, John C. Tarczon, W.P. Halperin, and J.O. Brittain, Proc. of the sixth Risf Int. Conf. on Materials Science, Transport Structure Relations in Fast Ion and Mixed Conductors, Sept. 9-13, (1985).
55.	Interpretation of NMR Diffusion Measurements in Uniform and Nonuniform Field Profiles, John C. Tarczon and W.P. Halperin, Phys. Rev. B 32, 2798 (1985).
54.	Nuclear Magnetic Resonance Study of the Electronic Structure in the Copper Niobium Superlattice, M. Yudkowsky, W.P. Halperin, and Ivan K. Schuller, Phys. Rev. B 31, 1637 (1985).
53.	Li Self Diffusion in Pure and Doped b-LiAl Using Pulsed Field Gradient NMR, S.C.Chen, John C. Tarczon, W.P. Halperin, and J.O. Brittain, J. Phys. Chem. of Solids 46, 895 (1985).
52.	Dispersion Induced Splitting of Order Parameter Collective Modes in Superfluid ³He-B, P.N. Brusov, V.N. Popov, B.S. Shivaram, M.W. Meisel, B.K. Sarma, W.P. Halperin and J.B. Ketterson, Proc. of the 17^th Int. Conf. Low Temp. Phys. 2, 779 (1984).
51.	Interaction Effects and Collective Modes in Superfluid ³He, B.S. Shivaram, M.W. Meisel, B.K. Sarma, W.P. Halperin and J.B. Ketterson, Proc. of the 17^th Int. Conf. Low Temp. Phys. 2, 759 (1984).
50.	Explanation of the Excess Attenuation Near the Pair Breaking Edge in ³He-B, M.W. Meisel, B.S. Shivaram, Bimal K. Sarma, J.B. Ketterson, W.P. Halperin and P. Wölfle, Proc. of the 17^th Int. Conf. Low Temp. Phys. 2, 757 (1984).
49.	A Low Temperature Calorimetric Investigation of CoGa Spin-Glass, H. Akbarzadeh, P.H. Keesom, M.W. Meisel, and W.P. Halperin, Phys. Rev. B 29 2622 (1984).
48.	Probing Collective Modes of Superfluid ³He with Zero Sound, J.B. Ketterson, B.S. Shivaram, M.W. Meisel, B.K. Sarma, and W.P. Halperin, AIP Conf. Proc. 103, 288 (1983).
47.	Acoustic Impedance Investigations of the Collective Modes of ³He, J.B. Ketterson, B.S. Shivaram, M.W. Meisel, B.K. Sarma, and W.P. Halperin, IEEE Ultrasonics Symposium, p. 1074 (1983).
46.	Zero Sound Measurements Near the Pair-Breaking Edge in Low Pressure ³He-B, M.W. Meisel, B.S. Shivaram, B.K. Sarma, J.B. Ketterson, and W.P. Halperin, Phys. Lett. A 98, 437 (1983).
45.	Ortho-Para Conversion of Hydrogen in Copper as Origin of Time Dependent Heat Leaks, M. Schwark, F. Pobell, W.P. Halperin, Ch. Buchal, J. Hanssen, M. Kubota, R.M. Mueller, J. Low Temp. Phys. 53, 685 (1983).
44.	Study of Protonic Diffusion in Hydrogen Uranyl Phosphate Using a Pulsed-Field Gradient NMR Method, Y.-T. Tsai, W.P. Halperin, and D.H. Whitmore, J. of Solid State Chemistry 50, 263 (1983).
43.	Study of Proton Diffusion in NH₄⁺-H₃O⁺b"-Alumina Using a Pulsed-Field Gradient NMR Method, Y.-T. Tsai, S. Smoot, D.H. Whitmore, J.C. Tarczon, and W.P. Halperin, Solid State Ionics 9/10, 1033 (1983).
42.	Magnetic Field Study of the Squashing Collective Mode in ³He-B, M.W. Meisel, B.S. Shivaram, Bimal K. Sarma, D.B. Mast, J.B. Ketterson, and W.P. Halperin, Phys. Rev. B 27, 6982 (1983).
41.	Equilibrium Magnetic Behavior in CoGa Spin Glass, Wen-Sheng Zhou, M.W. Meisel, J.R. Owers-Bradley, W.P. Halperin, Y. Ochai, and J.O. Brittain, Phys. Rev. B 27, 3119 (1983).
40.	Non-Linear Zeeman Shifts in the Collective Mode Spectrum of ³He-B, B.S. Shivaram, M.W. Meisel, Bimal K. Sarma, W.P. Halperin and J.B. Ketterson, Phys. Rev. Lett. 50, 1070 (1983).
39.	Observation of a New Resonance in the Collective Mode Spectrum of ³He-A, M.W. Meisel, B.S. Shivaram, B.K. Sarma, J.B. Ketterson, and W.P. Halperin, Phys. Rev. Lett. 50, 361 (1983).
38.	Resolution of New Structure in the Collective Mode Spectrum of Superfluid ³He-B, B.S. Shivaram, M.W. Meisel, B.K. Sarma, D.B. Mast, W.P. Halperin and J.B. Ketterson, Phys. Rev. Lett. 49, 1646 (1982).
37.	Acoustic Order Parameter Mode Spectroscopy in Superfluid ³He-B, W.P. Halperin, Physica B 109&110, 1596 (1982).
36.	Magnetic Properties of CoGa Alloys and the Transition from Spin Glass to Ferromagnetism, M.W. Meisel, Wen-Sheng Zhou, J.R. Owers-Bradley, Y. Ochai, J.O. Brittain, and W.P. Halperin, J. Phys. F: Metals Phys. 12, 317 (1982).
35.	Measurements of the Acoustic Impedance of Superfluid ³He-B, D.B. Mast, J.R. Owers-Bradley, W.P. Halperin, I.D. Calder, B.K. Sarma, and J.B. Ketterson, Physica B 107, 953 (1981).
34.	NMR Study of Platinum Microcrystals and Application to Thermometry, I. Yu, and W.P. Halperin, Physica B 107, 329 (1981).
33.	Magnetic Phase Diagram of Slow Cooled b-Phase CoGa Alloys, M.W. Meisel, Wen-Sheng Zhou, J.R. Owers-Bradley, W.P. Halperin, Y. Ochai, and J.O. Brittain, Physica B 107, 249 (1981).
32.	Interplanar Magnetic Coupling in Cu/Ni Composition Modulated Alloys, Wen-Sheng Zhou, H.K. Wong, J.R. Owers-Bradley, and W.P. Halperin, Physica B 108, 953 (1981).
31.	Investigation of Platinum Particles by Nuclear Magnetic Resonance, I. Yu, and W.P. Halperin, J. Chimie Physique 78, 901 (1981).
30.	NMR Study of Pure and Doped b-LiAl, K. Kishio, J.R. Owers-Bradley, W.P. Halperin, and J.O. Brittain, J. Phys. Chem. of Solids 42, 1031 (1981).
29.	The Micro-Electronic Structure of Platinum Particles Investigated by NMR, I. Yu, and W.P. Halperin, J. Low Temp. Phys. 45, 189 (1981).
28.	Versatile Pulsed RF Heterodyne Spectrometer, A.A.V. Gibson, J.R. Owers-Bradley, I.D. Calder, J.B. Ketterson, and W.P. Halperin, Rev. Sci. Instr. 52, 1509 (1981).
27.	Simple Wide Temperature Range AC Susceptometer, J.R. Owers-Bradley, Wen-Sheng Zhou, and W.P. Halperin, Rev. of Sci. Instr. 52, 1106 (1981).
26.	NMR Study of Pure and Doped b-LiAl, K. Kishio, J.R. Owers-Bradley, W.P. Halperin, and J.O. Brittain, Solid State Ionics 5, 425 (1981).
25.	NMR Study of a Smectic A-Smectic B Transition, J.R. Owers-Bradley, I.D. Calder, J.B. Ketterson, and W.P. Halperin, Molecular Crystals and Liquid Crystals 76, 175 (1981).
24.	Group Velocity Spectroscopy of Collective Modes in ³He-B, I.D. Calder, D.B. Mast, B.K. Sarma, J.R. Owers-Bradley, J.B. Ketterson, and W.P. Halperin, Phys. Rev. Lett. 45, 1866 (1980).
23.	Measurements of High Frequency Sound Propagation in ³He-B, D.B. Mast, B.K. Sarma, J.R. Owers-Bradley, I.D. Calder, J.B. Ketterson, and W.P. Halperin, Phys. Rev. Lett. 45, 266 (1980).
22.	Spin Glass Behavior of CoGa Compounds, M.W. Meisel, W.P. Halperin, Y. Ochai, and J.O. Brittain, J. Phys. F: Metals Phys. 10, L105 (1980).
21.	Observation of Conduction Electron Density Oscillations at the Surface of Platinum Particles, I. Yu, A.A.V. Gibson, E.R. Hunt, and W.P. Halperin, Phys. Rev. Lett. 44, 348 (1980).
20.	On the Use of CMN Thermometry in Specific heat Measurements Below 10 mK, W.P. Halperin, Jour. de Phys. 40, L-373 (1979).
19.	Carbon Powder Magnetization Thermometry for Very Low Temperatures, C.M. Bastuscheck, R.A. Buhrman, B.K. Sarma, D.B. Mast, J.B. Ketterson, and W.P. Halperin, Jour. de Phys. C6-1164 (1978).
18.	Very Low Temperature Search for Superconductivity in Pd, Pt, and Rh, R.A. Webb, J.B. Ketterson, W.P. Halperin, J.J. Vuillemin, and N.B. Sandesara, J. Low Temp. Phys. 32, 659 (1978).
17.	Fiberglass Insert to Liquid Helium Dewar, S.Y. Shen, W.P. Halperin, and J.B. Ketterson, Rev. Sci. Instr. 49, 542 (1978).
16.	Melting Properties of ³He: Specific Heat, Entropy, Latent heat, and Temperature, W.P. Halperin, F.B. Rasmussen, C.N. Archie, and R.C. Richardson, J. Low Temp. Phys. 31, 617 (1978).
15.	Refrigeration by Adiabatic Demagnetization of Nuclear Spins, S.Y. Shen, J.B. Ketterson, and W.P. Halperin, J. Low Temp. Phys. 31, 193 (1978).
14.	³He Melting Pressure Temperature Scale, W.P. Halperin, F.B. Rasmussen, C.N. Archie, and R.C. Richardson, Proc. of the 6^th Int. Cryogenic Eng. Conf. IPC. Science and Technology Press, p. 194, 1976.
13.	Specific Heat of Normal and Superfluid ³He on the Melting Curve, W.P. Halperin, C.N. Archie, F.B. Rasmussen, T.A. Alvesalo, and R.C. Richardson, Phys. Rev. B 13, 2124 (1976).
12.	Specific Heat and Entropy of Solid ³He Below 23 mK, F.B. Rasmussen, W.P. Halperin, C.N. Archie, and R.C. Richardson, Proc. of the 14^th Int. Conf. on Low Temp. Phys. 1, 513 (1975).
11.	Specific Heat of the ³He Superfluid in Several Magnetic Fields, C.N. Archie, W.P. Halperin, F.B. Rasmussen, C.M. Gould, T.A. Alvesalo, and R.C. Richardson, Proc. of the 14^th Int. Conf. on Low Temp. Phys. 1, 96 (1975).
10.	A Thermodynamic Temperature Scale Derived from Measurements of ³He Latent Heat, W.P. Halperin, C.N. Archie, F.B. Rasmussen, and R.C. Richardson, Phys. Rev. Lett. 34, 718 (1975).
9.	A Thermodynamic Temperature Scale Derived from Measurements of ³He Latent heat, W.P. Halperin, C.N. Archie, F.B. Rasmussen, and R.C. Richardson, Proc. of the Euro. Phys. Soc. Topical Conf. on Liquid and Solid Helium, Haifa Israel, (John Wiley and Sons, New York) August, (1974).
8.	Observation of Nuclear Magnetic Order in Solid ³He, W.P. Halperin, C.N. Archie, F.B. Rasmussen, R.A. Buhrman, and R.C. Richardson, Phys. Rev. Lett. 32, 927 (1974).
7.	The Elimination of Supercooling in Superconductors by the Proximity Effect, New Bounds on T_c for Mg, Ag, and Au, R.A. Buhrman, and W.P. Halperin, J. Low Temp. Phys. 16, 409 (1974).
6.	First Order Character of the B-Transition in Liquid ³He, W.P. Halperin, R.A.Buhrman, D.M. Lee, and R.C. Richardson, Phys. Lett. A 45, 233 (1973).
5.	Fluctuation Diamagnetism in "Zero Dimensional" Superconductor, R.A. Buhrman, and W.P. Halperin, Phys. Rev. Lett. 30, 692 (1973).
4.	Thermodynamic Fluctuations in "Zero Dimensional Superconductor", R.A. Buhrman, W.P. Halperin, and W.W. Webb, Proc. of the 13^th Int. Conf. on Low Temp. Phys. 3, 682 (1972).
3.	Properties of ³He on the Melting Curve, W.P. Halperin, R.A. Buhrman, W.W. Webb, and R.C. Richardson, Proc. of the 13^th Int. Conf. on Low Temp. Phys. 2, 139 (1972).
2.	Static Nuclear Magnetization Thermometry in the Milli-Kelvin Region, R.A. Buhrman, W.P. Halperin, S.W. Swenterley, J.D. Reppy, R.C. Richardson, and W.W. Webb, Proc. 12^th Int. Conf. on Low Temp. Phys. 831, (1970).
1.	Further Observations of the g-Cygni Radio Source, L.A. Higgs, and W.P. Halperin, Mon. Not. R. Astr. Soc. 209, 141 (1968).