Low Temperature Physics: 37, 964 (2011); https://doi.org/10.1063/1.3672653 (11 pages)
Fizika Nizkikh Temperatur: Volume 37, Number 11 (November 2011), p. 1209-1220    ( to contents , go back )

The Landau band effects in the quantum magnetic oscillations and the deviations from the quasiclassical Lifshitz-Kosevich theory in quasi-two-dimensional conductors

V.M. Gvozdikov

Kharkov National University, Kharkov 61077, Ukraine
Max-Planck-Institut für Physik Komplexer Systeme, 38 Nöthnitzer Strasse, D-01187 Dresden, Germany
E-mail: vladimir.gvozdikov@gmail.com
pos Анотація:

Received May 24, 2011

Abstract

The quantum magnetic oscillations (QMO) in the layered and quasi-two-dimensional (2D) conductors deviate from the quasiclassical Lifshitz–Kosevich (LK) theory developed for 3D conventional metals. We discuss deviations related to the broadening of the Landau levels into Landau bands by various mechanisms (layer-stacking, magnetic breakdown, incoherence, disorder, localization etc.). Each mechanism yields a specific factor modulating the QMO amplitudes depending on the density of states and electron velocities within the Landau bands. In contrast to the LK theory, these factors differ for the thermodynamic (de Haas–van Alphen (dHvA)) and kinetic (Shubnikov–de Haas (SdH)) oscillations. We calculated the magnetic breakdown damping factors for the SdH and dHvA oscillations in the 2D conductors and analyzed their difference as well as the analogy between the bandwidth and Weiss oscillations. In case of an isotropic 3D metals the kinetic factors become proportional to the thermodynamic ones as is assumed in the LK theory.

PACS: 71.18.+y Fermi surface: calculations and measurements; effective mass, g factor;
PACS: 72.15.Gd Galvanomagnetic and other magnetotransport effects;
PACS: 73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects).

Key words: quantum magnetic oscillations, quasi-two-dimensional conductors, magnetic breakdown, damping factors.

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