The magnetic-field dependence of the thermopower in layered conductors with a quasi-two-dimensional electron energy spectrum of arbitrary form is investigated theoretically. It is shown that the dependence of the thermopower on the magnitude and orientation of the magnetic field with respect to the layers contains detailed information about the velocity distribution of the charge carriers on the Fermi surface.

The dependence of the magnetoresistance oscillations in layered organic conductors with a multisheet Fermi surface on the angle between the magnetic field and the normal to the layers is studied theoretically in the condition of possible magnetic breakdown between different sheets of the Fermi surface. It is shown that the distance between separate cavities of the Fermi surface in momentum space can be determined from the periods of magnetic breakdown oscillations.

The method for investigating the electron properties of metals, which was developed by I. M. Lifshits under the assumption that the form of the energy–momentum relation for charge carriers is known a priori, and for reconstructing the electron energy spectrum from experimental data is applied for studying acoustoelectronic effects in layered conductors with a strongly anisotropic conductivity of the metallic type. It is shown that the attenuation of acoustic waves propagating along the layers can become much weaker in strong magnetic fields. The conditions for acoustic transparency of layered conductors with a quasi-two-dimensional electron spectrum are obtained, and the oscillatory dependence of acoustic damping decrement on the magnetic field is analyzed for various orientations of the acoustic wave vector and the magnetic field.

Abstract:A linear response of the electron system of multilayer conducting structures placed in a strong magnetic field to an external action in the form of an electric field and a temperature gradient is studied theoretically. It is shown that joint investigations of the magnetoresistance and the thermo-emf allows new important information on the structure of the electron energy spectrum to be obtained and the presence of Q1D sheets of the Fermi surface to be revealed. c Versita Warsaw and Springer-Verlag Berlin Heidelberg. All rights reserved.Keywords: Layered conductor, thermoelectric effect, quantum oscillations PACS (2006): 71.18+y, 72.15 Jf A considerable number of microscopic multilayered structures of organic origin possess sharply anisotropic electrical conductivity of a metallic type. The in-plane conductivity is much higher than the conductivity along the normal n to the layers, which enables us to suggest that the probability of electron tunnelling between the layers is small. In calculating the electrical conductivity and thermoelectrical coefficients such anisotropy should be taken into account with the help of the low dimensional character of the electron energy spectrum, i.e. the energy of conduction electrons ε(p) depends weakly on the momentum projection p z = np onto the normal n to the layers [1,2].

The linear response of the electronic system of a layered conductor to the presence of a temperature gradient is investigated theoretically. The dependence of the thermoelectric power on the temperature and external magnetic field is found at temperatures below the Debye temperature. Experimental investigation of this dependence will make it possible to study different relaxation mechanisms in a system of conduction electrons and to determine the structure of the electronic energy spectrum.