Volume 86, Number 2, April 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||06 May 2009|
Fluctuations of the superconducting order parameter as an origin of the Nernst effect
Department of Condensed Matter Physics, The Weizmann Institute of Science - Rehovot 76100, Israel
2 Department of Physics, Texas A&M University - College Station, TX 77843-4242, USA
Corresponding author: firstname.lastname@example.org
Accepted: 31 March 2009
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.
PACS: 72.10.Bg – General formulation of transport theory / 73.50.Lw – Thermoelectric effects / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
© EPLA, 2009
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