TAILIEUCHUNG - Effect of higher landau levels on the transverse thermoelectric conductivity in high-TC superconductors

We investigate effect of higher Landau levels on the transverse thermoelectric conductivity αxy, describing the Nernst effect in high-Tc superconductors, by using the time-dependent Ginzburg-Landau theory in two-dimensional model with thermal noise. The transverse thermoelectric conductivity is calculated in the self-consistent Gaussian approximation. Our results indicate that the contribution of higher Landau levels is less than that of lower Landau levels to the transverse thermoelectric conductivity. Our results are in good agreement with experimental data on high-Tc superconductor. | Communications in Physics, Vol. 26, No. 3 (2016), pp. 279-285 DOI: EFFECT OF HIGHER LANDAU LEVELS ON THE TRANSVERSE THERMOELECTRIC CONDUCTIVITY IN HIGH-Tc SUPERCONDUCTORS BUI DUC TINH† Department of Physics, Hanoi National University of Education 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam † E-mail: tinhbd@ Received 13 October 2016 Accepted for publication 07 December 2016 Abstract. We investigate effect of higher Landau levels on the transverse thermoelectric conductivity αxy , describing the Nernst effect in high-Tc superconductors, by using the time-dependent Ginzburg-Landau theory in two-dimensional model with thermal noise. The transverse thermoelectric conductivity is calculated in the self-consistent Gaussian approximation. Our results indicate that the contribution of higher Landau levels is less than that of lower Landau levels to the transverse thermoelectric conductivity. Our results are in good agreement with experimental data on high-Tc superconductor. Keywords: transverse thermoelectric conductivity, time-dependent Ginzburg-Landau theory, highTc superconductor. Classification numbers: , , . I. INTRODUCTION Recently the Nernst effect in high-Tc superconductors has attracted attention both theoretically [1–5] and experimentally [6–11]. The electric field is induced in a metal under magnetic field by the temperature gradient ∇T perpendicular to the magnetic field H, phenomenon known as the Nernst effect [1]. In the mixed state the Nernst effect is large due to vortex motion, while in the normal state and in the vortex lattice or glass states it is typically smaller. The appearance of a fluctuation tail above the critical temperature in the Nernst signal was observed in strongly type-II superconductors, both low-Tc like NbSe2 and films [12] and several different hightemperature materials [6, 7, 10, 11]. The Nernst effect therefore is a probe of thermal fluctuations phenomena in

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