Thermoelectric mechanism of electromagnetic-acoustic transformation in organic conductors

Faculty of Natural Sciences and Mathematics, Institute of Physics - P.O. Box 162, 1000 Skopje, Macedonia

Received: 5 November 2007
Accepted: 3 December 2007

Abstract

The thermoelectric mechanism of electromagnetic-acoustic transformation of the energy in an organic conductor with a quasi–two-dimensional electron energy spectrum (Q2D) placed in an external magnetic field has been considered. The amplitude of the acoustic wave excited by the temperature oscillations in a Q2D organic conductor was calculated for both the isothermal and the adiabatic thermal boundary condition. Angular oscillations of the amplitude resulting from the periodic dependence of the electron velocity on the angle between the normal to the layers and the magnetic field has been observed as expected. A comparison with the inductive mechanism of EMAT is made in order to determine the conditions at which the thermoelectric mechanism is dominant over the inductive one in the presence of a magnetic field. The thermoelectric mechanism of EMAT allows new important information on the electronic structure of the organic layered conductors to be obtained.