Anisotropic system of quasiparticles in superfluid helium

The thermodynamic properties of anisotropic quasiparticle systems of He II are considered for all degrees of anisotropy. It is shown that the thermodynamic functions of a strongly anisotropic phonon-roton system are mainly determined by rotons at all temperatures. Analytical expressions for the roto...

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Bibliographic Details
Published in:	Physical review letters Vol. 96; no. 6; p. 065301
Main Authors:	Adamenko, I N, Nemchenko, K E, Slipko, V A, Wyatt, A F G
Format:	Journal Article
Language:	English
Published:	United States 17-02-2006
Subjects:	ANISOTROPY CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS HELIUM HELIUM 4 MATERIALS SCIENCE PHONONS QUASIPARTICLE-PHONON MODEL ROTONS STABILITY SUPERFLUIDITY THERMODYNAMIC PROPERTIES
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Summary:	The thermodynamic properties of anisotropic quasiparticle systems of He II are considered for all degrees of anisotropy. It is shown that the thermodynamic functions of a strongly anisotropic phonon-roton system are mainly determined by rotons at all temperatures. Analytical expressions for the roton thermodynamic functions are obtained for all degrees of anisotropy. The maximum anisotropy is limited by the criterion for thermodynamic stability, which is here derived for the whole temperature range.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.96.065301