Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.35: Poster

Wednesday, March 29, 2006, 14:30–18:30, P1

Thermoelectric effects in layered conductors with a multisheet Fermi surface — •Olga Kirichenko and Valentin Peschansky — B.I.Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkov, Ukraine

Thermoelectric effects in layered organic conductors with the Fermi surface consisting of topologically different sheets in the form of cylinders and planes with weak corrugation of an arbitrary form, are studied theoretically. It is shown that at low enough temperatures, when account of the quantization of charge carriers orbital motion in a magnetic field is essential, the dependence of thermoelectric field upon reciprocal magnetic field takes the form of giant oscillations. Thermomagnetic coefficients of a layered conductor are shown to depend periodically upon the angle between the magnetic field direction and the normal to the layers. The presence of a group of charge carriers with a Q1D dispersion relation results in the strong anisotropy of thermoelectrical coefficients due to the existence of preferred direction for velocities of electrons belonging to this group. Experimental investigations of thermoresistanse and thermo-emf at different orientations of the magnetic field with respect to the layers allows to study in detail the energy spectrum of conduction electrons, in particular to determine electron effective masses and the distribution of their velocities at the Fermi surface.