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Giant Nernst effect due to fluctuating cooper pairs in superconductors
M N Serbyn1, M A Skvortsov, A A Varlamov
1Landau Institute for Theoretical Physics, Chernogolovka, Moscow Region, 142432, Russia.
Superconducting fluctuation theory explains the giant Nernst effect in 2D superconductors. This effect, driven by fluctuating Cooper pairs, is significant even away from the critical temperature.
Area of Science:
- Condensed Matter Physics
- Superconductivity Theory
Background:
- The Nernst effect in superconductors is crucial for understanding their electronic properties.
- Existing theories struggle to explain large Nernst signals observed in experiments.
Purpose of the Study:
- To develop a theoretical framework for the fluctuation-induced Nernst effect in 2D superconductors.
- To explain the origin of giant Nernst signals observed in experiments.
Main Methods:
- Derivation of a phenomenological formula for the Nernst coefficient.
- Microscopic calculation using the Matsubara-Kubo formalism for arbitrary magnetic fields and temperatures.
Main Results:
- A formula explaining the giant Nernst signal due to fluctuating Cooper pairs.
- Demonstration that this signal can exceed Fermi liquid contributions significantly.
- Experimental Nernst signals in disordered superconducting films are well-explained by the theory.
Conclusions:
- Superconducting fluctuation theory provides a robust explanation for the Nernst effect in 2D systems.
- The developed theory accurately predicts experimental observations in disordered superconducting films.
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