Giant Nernst effect due to fluctuating cooper pairs in superconductors
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...
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| Published in | Physical review letters Vol. 102; no. 6; p. 067001 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
13.02.2009
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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. |
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| AbstractList | 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. |
| Author | Galitski, Victor Skvortsov, M A Varlamov, A A Serbyn, M N |
| Author_xml | – sequence: 1 givenname: M N surname: Serbyn fullname: Serbyn, M N organization: Landau Institute for Theoretical Physics, Chernogolovka, Moscow Region, 142432, Russia – sequence: 2 givenname: M A surname: Skvortsov fullname: Skvortsov, M A – sequence: 3 givenname: A A surname: Varlamov fullname: Varlamov, A A – sequence: 4 givenname: Victor surname: Galitski fullname: Galitski, Victor |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/19257624$$D View this record in MEDLINE/PubMed |
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| References | 21517431 - Phys Rev Lett. 2011 Apr 1;106(13):139701; discussion 139702 |
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