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

Autor:	Lawrence W. Hrubesh, Young S. Lee, Lidiya Polukhina, J. F. Poco, Barry I. Barker, Douglas D. Osheroff
Rok vydání:	2000
Předmět:	Superfluidity Phase transition Materials science Condensed matter physics Phase (matter) General Physics and Astronomy Aerogel Supercooling Isotopes of helium Magnetic susceptibility Magnetic field
Zdroj:	Physical Review Letters. 85:2148-2151
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.85.2148
Popis:	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 T(c) but can be supercooled to below 0.8T(c). 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 T(c) at pressures as low as 12 bars in a magnetic field of 28.4 mT.
Databáze:	OpenAIRE
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