Strong-coupling effects in superfluid {sup 3}He in aerogel

Journal Article · Sat Sep 01 04:00:00 EDT 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.76.104512· OSTI ID:21055153

Aoyama, Kazushi; Ikeda, Ryusuke ^[1]

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1. Department of Physics, Kyoto University, Kyoto 606-8502 (Japan)

Effects of impurity scatterings on the strong-coupling (SC) contribution, stabilizing the ABM (axial) pairing state, to the quartic term of the Ginzburg-Landau free energy of superfluid {sup 3}He are theoretically studied to examine recent observations suggestive of an anomalously small SC effect in superfluid {sup 3}He in aerogels. To study the SC corrections, two approaches are used. One is based on a perturbation in the short-range repulsive interaction, and the other is a phenomenological approach used previously for the bulk liquid by Sauls and Serene [Phys. Rev. B 24, 183 (1981)]. It is found that the impurity scattering favors the BW pairing state and shrinks the region of the ABM pairing state in the T-P phase diagram. In the phenomenological approach, the resulting shrinkage of the ABM region is especially substantial and, if assuming an anisotropy over a large scale in aerogel, leads to justifying the phase diagrams determined experimentally.

• OSTI ID: 21055153
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 10 Vol. 76; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
FREE ENERGY
GELS
GINZBURG-LANDAU THEORY
HELIUM 3
IMPURITIES
LIQUIDS
PERTURBATION THEORY
PHASE DIAGRAMS
SCATTERING
STRONG-COUPLING MODEL
SUPERFLUIDITY