Observation of a Superfluid He-3 A- B Phase Transition in Silica Aerogel

Phys. Rev. Lett. 85, 2148 – Published 4 September 2000
B. I. Barker, Y. Lee, L. Polukhina, D. D. Osheroff, L. W. Hrubesh, and J. F. Poco

Abstract

New NMR studies of 3He in high-porosity aerogel reveal a phase transition from an A-like to a B-like phase on cooling. The evidence includes frequency shift and magnetic susceptibility data, and similar behavior is found in two quite different aerogel samples. The A-like phase is stable only very near to Tc but can be supercooled to below 0.8Tc. This behavior has been seen clearly at 32- and 24-bar pressures, and the presence of negative frequency shifts suggests that an A-like phase exists near Tc at pressures as low as 12 bars in a magnetic field of 28.4 mT.

DOI: http://dx.doi.org/10.1103/PhysRevLett.85.2148

  • Received 5 June 2000
  • Published in the issue dated 4 September 2000

© 2000 The American Physical Society

Authors & Affiliations

B. I. Barker*, Y. Lee, L. Polukhina, and D. D. Osheroff

  • Department of Physics, Stanford University, Stanford, California 94305-4060

L. W. Hrubesh and J. F. Poco

  • Chemistry and Material Science, Lawrence Livermore National Laboratory, Box 808, Livermore, California 94550

  • *Current address: Department of Physics, University of California, Berkeley, CA 94726-7300.Electronic address: bbarker@socrates.berkeley.edu

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