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Phys. Rev. Lett. 85, 2148–2151 (2000)

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

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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

Received 5 June 2000; published in the issue dated 4 September 2000

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.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.2148
DOI:
10.1103/PhysRevLett.85.2148
PACS:
67.57.Lm, 67.57.Pq

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

 
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