A-B Phase Transition and Pinning of Phase Boundary of Superfluid 3He in Aerogel

Journal Article · Thu Sep 07 04:00:00 EDT 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2354679· OSTI ID:20877564

Ishikawa, Osamu; Kado, Ryusuke; Obara, Ken; Yano, Hideo; Hata, Tohru ^[1]; Nakagawa, Hisashi ^[2]; Yokogawa, Hiroshi; Yokoyama, Masaru ^[3]

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1. Graduate School of Science, Osaka City University, Osaka 558-8585 (Japan)
2. Metrology Institute of Japan, Advanced Industrial Science and Technology Tsukuba, 305-8563 (Japan)
3. Matsushita Electric Works Ltd. Kadoma, Osaka, 571-0500 (Japan)

Phase transition in superfluid 3He in aerogel has been studied by NMR. Above 19 bar, we have clearly observed the A-like and B-like phases by following changes in the NMR lineshapes and resonance frequencies. There is a wide temperature region in which the A-like phase and the B-like phase coexist, extending from near the superfluid transition temperature T{sub c}{sup aero} to the lowest temperature of coexistence, T{sub AB}{sup aero}, below which only the B-like phase exists. There are two temperature regions, only in which the phase conversion occurs. Both regions are a few tens of {mu}K wide, the upper region being just below T{sub c}{sup aero} and the lower one just above T{sub AB}{sup aero}. In cooling down and warming up with the two phases in coexistence, no phase conversion occurs between the two regions. The phase boundary between the A-like phase and B-like phase cannot move in aerogel due to strong pinning by inhomogenities of aerogel.

• OSTI ID: 20877564
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 850; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONVERSION
COOLING
GELS
HELIUM 3
NUCLEAR MAGNETIC RESONANCE
PHASE TRANSFORMATIONS
SUPERFLUIDITY
TRANSITION TEMPERATURE