Quantum kinetic approach to the calculation of the Nernst effect

Details Quantum kinetic approach to the calculation of the Nernst effect Quantum kinetic approach to the calculation of the Nernst effect

2009-12-21

arxiv.org/abs/0912.4219v1

Physical Review B 80, 214516 (2009)

Physics

Condensed Matter

Superconductivity

24 pages, 13 figures

Scientific paper

We show that the strong Nernst effect observed recently in amorphous superconducting films far above the critical temperature is caused by the fluctuations of the superconducting order parameter. We employ the quantum kinetic approach for the derivation of the Nernst coefficient. We present here the main steps of the calculation and discuss some subtle issues that we encountered while calculating the Nernst coefficient. In particular, we demonstrate that in the limit T=0 the contribution of the magnetization ensures the vanishing of the Nernst signal in accordance with the third law of thermodynamics. We obtained a striking agreement between our theoretical calculations and the experimental data in a broad region of temperatures and magnetic fields.

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