Fizika Nizkikh Temperatur: Volume 43, Number 9 (September 2017), p. 1295-1302    ( to contents , go back )

Electric polarization of He II caused by first and second sounds

I.N. Adamenko and E.K. Nemchenko

V.N. Karazin Kharkiv National University, 4 Svobody Sq., Kharkiv 61022, Ukraine
E-mail: ig.nik.adamenko@gmail.com

Received October 19, 2016, revised November 22, 2016

Abstract

It is shown that in the three component quazi-particle gas of the superfluid helium (He II), which is formed by phonons, rotons and quantizied vortex rings, an equilibrium sets up instantly in the time scaled of the experiment. As a result, the normal component is created, that can move relative to the super-fluid component with a velocity w. It is shown that in the presence of w an electric field arises that was observed in the experiments. The reasons are in the anisotropic dependence of the QVR energy on its momentum in the presence of w and the existence of a dipole moment of QVR. The case when the QVR dipole moment is formed by its own dipole moment and by the dipole moment created by an external field is considered. The problem of the appearance of an electric field in a standing wave of second sound in an external constant electric field is solved. The electric potentials arising in the wave of the first sound due to the flexoelectrical effect, the acceleration of the liquid and the external constant electric field are obtained. Numerical calculations are performed on the obtained formulas, make it possible to compare the theory with the experiments, and can stimulate the formulation of new experiments.

PACS: 67.25.D– Superfliud phase;
PACS: 67.25.dk Vortices and turbulence;
PACS: 67.25.dt Sound and excitations.

Key words: superfluid, helium, first and second sounds, polarization, electric field.

Published online: July 25, 2017

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