Renormalization-group study of superfluidity and phase separation of helium mixtures immersed in a nonrandom aerogel

Journal Article · Sat Feb 01 00:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.3798· OSTI ID:450392

Lopatnikova, A; Berker, A N ^[1]

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1. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

Superfluidity and phase separation in {sup 3}He-{sup 4}He mixtures immersed in a jungle-gym (nonrandom) aerogel are studied by renormalization-group theory. Phase diagrams are calculated for a variety of aerogel concentrations. Superfluidity at very low {sup 4}He concentrations and a depressed tricritical temperature are found at the onset of superfluidity. A superfluid-superfluid phase separation, terminating at an isolated critical point, is found entirely within the superfluid phase. These phenomena and trends with respect to aerogel concentration are explained by the connectivity and tenuousness of a jungle-gym aerogel. {copyright} {ital 1997} {ital The American Physical Society}

• DOE Contract Number: FG02-92ER45473
• OSTI ID: 450392
• Journal Information: Physical Review, B: Condensed Matter, Vol. 55, Issue 6; Other Information: PBD: Feb 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELIUM II
PHASE DIAGRAMS
BINARY MIXTURES
SUPERFLUIDITY
GELS
CRITICAL TEMPERATURE
CONCENTRATION RATIO
THERMODYNAMIC PROPERTIES
RENORMALIZATION
HELIUM 3