Magnus force and acoustic Stewart-Tolman effect in type-II superconductors

Abstract

At zero magnetic field we have observed an electromagnetic radiation from\nsuperconductors subjected by a transverse elastic wave. This radiation has an\ninertial origin, and is a manifestation of the acoustic Stewart-Tolman effect.\nThe effect is used for implementing a method of measurement of an effective\nMagnus force in type II superconductors. The method does not require the flux\nflow regime and allows to investigate this force for almost the whole range of\nthe existence of the mixed state. We have studied behavior of the gyroscopic\nforce in nonmagnetic borocarbides and Nb. It is found that in borocarbides the\nsign of the gyroscopic force in the mixed state is the same as in the normal\nstate, and its value (counted for one vortex of unit length) has only a weak\ndependence on the magnetic field. In Nb the change of sign of the gyroscopic\nforce under the transition from the normal to the mixed state is observed.\n