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Phys Rev Lett. 2006 Feb 17;96(6):065301. doi: 10.1103/PhysRevLett.96.065301. Epub 2006 Feb 13.

Anisotropic system of quasiparticles in superfluid helium.

Physical review letters

I N Adamenko, K E Nemchenko, V A Slipko, A F G Wyatt

Affiliations

  1. Karazin Kharkov National University, Svobody Square 4, Kharkov 61077, Ukraine.

PMID: 16606004 DOI: 10.1103/PhysRevLett.96.065301

Abstract

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.

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