Fluctuations of the superconducting order parameter as an origin of the Nernst effect

Details Fluctuations of the superconducting order parameter as an origin of the Nernst effect Fluctuations of the superconducting order parameter as an origin of the Nernst effect

2008-12-22

arxiv.org/abs/0812.4268v2

Europhys. Lett. 86, 27007 (2009)

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures, extended version

Scientific paper

We show that the strong Nernst signal observed recently in amorphous superconducting films far above the critical temperature is caused by the fluctuations of the superconducting order parameter. We demonstrate a striking agreement between our theoretical calculations and the experimental data at various temperatures and magnetic fields. Besides, the Nernst effect is interesting not only in the context of superconductivity. We discuss some subtle issues in the theoretical study of thermal phenomena that we have encountered while calculating the Nernst coefficient. In particular, we explain how the Nernst theorem (the third law of thermodynamics) imposes a strict constraint on the magnitude of the Nernst effect.

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