Giant Nernst effect due to fluctuating cooper pairs in superconductors

M. N. Serbyn, M. A. Skvortsov, A. A. Varlamov, Victor Galitski

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78 Citations (Scopus)

Abstract

A theory of the fluctuation-induced Nernst effect is developed for a two-dimensional superconductor in a perpendicular magnetic field. First, we derive a simple phenomenological formula for the Nernst coefficient, which naturally explains the giant Nernst signal due to fluctuating Cooper pairs. The latter signal is shown to be large even far from the transition and may exceed by orders of magnitude the Fermi liquid terms. We also present a complete microscopic calculation of the Nernst coefficient for arbitrary magnetic fields and temperatures, which is based on the Matsubara-Kubo formalism. It is shown that the magnitude and the behavior of the Nernst signal observed experimentally in disordered superconducting films can be well understood on the basis of superconducting fluctuation theory.

Original languageEnglish
Article number067001
JournalPhysical Review Letters
Volume102
Issue number6
DOIs
Publication statusPublished - 9 Feb 2009
Externally publishedYes

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