Superfluidity and phase separation in {sup 3}He/{sup 4}He mixtures in aerogel

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Bulletin of the American Physical Society

OSTI ID:375694

Mulders, N; Yoon, J; Chan, M

Confinement of {sup 3}He/{sup 4}He mixtures in aerogels has a profound effect on the topology of the phase diagram. In aerogel of 98 both superfluid density and heat capacity measurements indicate that the lambda line continues into the low {sup 4}He concentration region, i.e., the authors find a dilute {sup 4}He superfluid phase. On the high {sup 4}He concentration side of the phase diagram, heat capacity measurements show a lambda peak and a discontinuity associated with phase separation very similar to those observed in bulk mixtures. Although torsional oscillator measurements indicate that there exists a well defined point of phase separation on both sides of the phase diagram, heat capacity results fail to find a clear cut signature of phase separation for the mixture of low {sup 4}He concentration. Surprisingly, in 87 appears as if the phase diagram is restored to the bulk topology.

• OSTI ID: 375694
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 40; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
GELS
HELIUM 3
HELIUM 4
MIXTURES
PHASE STUDIES
POROUS MATERIALS
SUPERFLUIDITY