Nonlinear dynamics of carriers in aluminum cryoconductors under the action of crossed electric and magnetic field

Abstract

Magnetic field as a reason of nonlinear electric phenomena is studied experimentally for normal metal conductors. For material under investigation being pure aluminum Corbino geometry of current flow and sample arrangement is applied. This approach gives a possibility to exclude an electric Hall field and to enlarge a sensitivity of conductor resistance to self magnetic field stimulated by transverse Hall drift under the action of Lorentz force. In accordance with a direction of radial current through the disk sample the own magnetic field coincides on direction with an external magnetic field or not. As a result electric kinetic properties are modified by this additional action of own carrier movement. The self magnetic field distribution on sample surface is measured at different conditions for a current flow and external magnetic field intensity. Nonlinear additions to the electric field potential distribution due to an own magnetic field are determined on the base of data for potential curves for collinear and anticollinear geometry. The physical reasons of nonlinearity and their connection with carrier dispersion law are discussed by the means of analytical investigation of high density charge transport under Corbino geometry. Phenomenological theory of electric field potential distribution under similar change transport is constructed with indication of metal specific difficulties for realization of this phenomenon.