Fizika Nizkikh Temperatur: Volume 44, Number 10 (October 2018), p. 1363-1367    ( to contents , go back )

Roton excitations in a condensed medium

A.I. Karasevskii

G.V. Kurdyumov Institute for Metal Physics, NASU, 36 Acad. Vernadsky Boulevard, Kyiv 03680, Ukraine
E-mail: akaras@imp.kiev.ua

Received May 7, 2018, published online August 28, 2018

Abstract

In the article it has been shown that in the melt near melting curve, in the many component liquids, dense gases and superfluid liquids the homogeneous state of the medium can be unstable. In a medium, nanoclusters can spontaneously form whose metastable stability is due to an increase in the orientational entropy during spontaneous rotation of nanoparticles. With a positive nanoparticle formation energy, their concentration is determined by the increase in the configuration entropy of the system. Similar the vacancies in crystals, roton clusters are structural defects of a melt.

Key words: nanoclusters, melts, thermodynamic equilibrium.

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