Magnetic Properties of Liquid 3He below 3 m°K

  • D. D. Osheroff
  • W. J. Gully
  • R. C. Richardson
  • D. M. Lee

Abstract

Features observed along the 3He melting curve in compressional cooling experiments have suggested that at least one and perhaps two phase changes take place in either the solid and/or the liquid 3He within the cell at temperatures below 3 m°K.1 In experiments in which the cell pressure was recorded as a function of time during periods in which the rate of compression dV/dt was held constant, two unexpected features were reproducibly obtained on the resulting pressurization curve which were labeled the A and B transitions, respectively, by Osheroff et al. The A transition is characterized by a sudden decrease in the rate of cell pressurization dP/dt upon cooling by roughly a factor of two in magnitude, all within a pressure interval of less than 3 × 10−4 atm. A nearly equal but opposite change in dP/dt is observed upon warming at precisely the same pressure. The pressure at which the A transition occurs in zero magnetic field is 1.70 × 10−1 atm above the cell pressure at 7 m°K, and P(A) is lowered by the application of magnetic fields by an amount roughly equal to −6.7 × 10−5 H 2 atm/kG2. The pressure P(A) corresponds to a temperature of about 2.7 m°K obtained by extrapolating the shifted melting curve of Johnson et al.1,2 The B transition is characterized by a sudden drop in cell pressure by about 3 × 10−4 atm upon cooling and by a brief hesitation in the cell pressure as it decreases upon warming (B’ transition). The pressure P(B’) is reproducibly 1.89 × 10−1 atm above the cell pressure at 7 m°K in zero magnetic field, and is shifted to higher pressures by the application of magnetic fields by an amount given roughly by ΔP = +2.02 × 10−3 H 2 atm/kG2.

Keywords

Helium Epoxy 

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References

  1. 1.
    D.D. Osheroff, R.C. Richardson, and D.M. Lee, Phys. Rev. Lett. 28, 855 (1972).ADSCrossRefGoogle Scholar
  2. 2.
    R.T. Johnson, O.V. Lounasmaa, R. Rosenbaum, O. G. Symko, and J.C. Wheatley, J. Low Temp. Phys. 2, 403 (1970).ADSCrossRefGoogle Scholar
  3. 3.
    W.P. Halperin, R.A. Buhrman, W.W. Webb, and R.C. Richardson, this volume.Google Scholar
  4. 4.
    J.C. Wheatley, private communication.Google Scholar

Copyright information

© Plenum Press, New York 1974

Authors and Affiliations

  • D. D. Osheroff
    • 1
  • W. J. Gully
    • 1
  • R. C. Richardson
    • 1
  • D. M. Lee
    • 1
  1. 1.Laboratory of Atomic and Solid State PhysicsCornell UniversityIthacaUSA

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