Giant Nernst Effect due to Fluctuating Cooper Pairs in Superconductors

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

doi:10.1103/PhysRevLett.102.067001

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Giant Nernst Effect due to Fluctuating Cooper Pairs in Superconductors

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

DOI 10.1103/PhysRevLett.102.067001 · Physical Review Letters

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	130	Pressure not reported	onset
Nb0.15Si0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown