Nernst effect and diamagnetism in phase fluctuating superconductors.
We study superconducting systems in the regime where superconductivity is destroyed by phase fluctuations. We find that the Nernst effect has a much sharper temperature decay than predicted by Gaussian fluctuations, with an onset temperature that tracks Tc rather than the pairing temperature. We find a close quantitative connection with diamagnetism--the ratio of magnetization to transverse thermoelectric conductivity reaches a fixed value at high temperatures. We interpret measurements on underdoped cuprates in terms of a dilute vortex liquid over a wide temperature range above Tc.
Podolsky
Daniel
D
Department of Physics, University of California, Berkeley, California 94720, USA.
Raghu
Srinivas
S
Vishwanath
Ashvin
A