Magnetobreakdown oscillations of Nernst-Ettingshausen field in layered conductors

Galbova Galbova

doi:10.5488/cmp.19.33701

Abstract

In the presented report, the Nernst-Ettingshausen effect in layered conductors is investigated. Considering a Fermi surface (FS) consisting of a slightly corrugated cylinder and two corrugated planes distributed periodically in the momentum space, the thermoelectric effects are considered under general assumptions for the value of a magnetic breakdown probability. As a result of an external generalized force, the FS sheets in layered conductors with a multisheet FS appear to be so close that the charge carriers (as a result of magnetic breakdown) can move from one FS sheet to another. In addition, the distribution functions of the charge carriers and the magnetic breakdown oscillations of thermoelectrical field along the normal to the layer, under different values and orientations of the magnetic field, $B$, are calculated. It is shown that if the magnetic field is deflected from the $xz$-plane at an angle $\varphi$, the oscillation part of a thermoelectrical field along the normal to the layer under condition $\sin\varphi\tan\vartheta \gg 1$ is mainly determined with the Nernst-Ettingshausen effect.

Highlights

The electronic phenomena that occur in degenerate conductors, in the presence of strong magnetic fields, are highly dependent on the electron energy spectrum
Dp is the diameter of a cylinder along the px axis
In the non-collision range (τ → ∞) are equal to the drifting of the electrons along an electrical field for a time period between two instants of the magnetic breakdown. This period estimated with accuracy to small corrections proportional to the quasi-two-dimensionality parameter of the electronic energy spectrum, η, is independent of λj, and corresponds to the period P of the electron drifting on the Fermi surface (FS) sheets 1 and 3, i.e., to a half-period P of the electron drifting along the closed sections of the corrugated cylinder

Summary

Introduction

The electronic phenomena that occur in degenerate conductors, in the presence of strong magnetic fields, are highly dependent on the electron energy spectrum. It was shown that the period of oscillations of magnetization in a quantized magnetic field, B , as a function 1/B is proportional to the extreme FS section The investigation of these oscillations, under different orientations of a magnetic field, allows for a complete determination of the form of the Fermi surface [2]. The angle oscillations were observed in multilayered conductors of organic origin (see, for example the articles [10,11,12,13,14,15,16,17,18,19]) and in different quasi-two-dimensional conductors This oscillation effect is essentially expressive under the tan θ 1 condition, where the cross section of the FS with the plane pB = (pB )/B = const is strongly extended along the axis pz = pn, and the velocity of. An enormous number of the theoretical and experimental works are devoted to the investigation of the Nernst-Ettingshausen effect (see, for example [24,25,26])

Formulation of the problem

Calculations

Discussion and conclusion