Issues

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1982

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June

  

Reviews of topical problems


Superflows and superfluidity

The basic concepts of the theory of mass superflows in a superfluid are presented. The stability of such flows with respect to the creation and growth of linear defects (superfluid vortices), the relationship between superflows and the existence of long-range order, and the possible occurrence of persistent flows in one- and two-dimensional systems are discussed. Some analogs of the mass superflows in a superfluid are also examined: spin superflows in magnetically ordered systems having an easy-plane anisotropy and the current states of a Bose condensate of electron-hole pairs. The physical meaning of such ``flows'' is discussed, and a theory for their stability is derived from the calculated probability for the creation of the linear defects which are analogs of superfluid vortices. There is a discussion of the applicability of the theory of spin superflows to several experiments on the magnetic properties of the A phase of superfluid helium-3 and to a possibility which follows from this theory: that domain walls might be generated in the interior of a sample of an easyplane magnetically ordered material and that the motion of these walls might be controlled by fields applied to the surface of the sample.

Fulltext pdf (1.1 MB)
Fulltext is also available at DOI: 10.1070/PU1982v025n06ABEH004564
PACS: 67.40.Vs, 67.50.Fi, 67.40.Bz (all)
DOI: 10.1070/PU1982v025n06ABEH004564
URL: https://ufn.ru/en/articles/1982/6/c/
Citation: Sonin É B "Superflows and superfluidity" Sov. Phys. Usp. 25 409–430 (1982)
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Оригинал: Сонин Э Б «Бездиссипативные потоки и сверхтекучесть» УФН 137 267–304 (1982); DOI: 10.3367/UFNr.0137.198206c.0267

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