Phys. Rev. Lett. 99, 117004 (2007) [4 pages]Nernst Effect and Diamagnetism in Phase Fluctuating SuperconductorsReceived 4 December 2006; published 13 September 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.117004
DOI:
10.1103/PhysRevLett.99.117004
PACS:
74.25.Fy, 74.40.+k, 74.72.−h, 74.81.Fa
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