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Phys. Rev. B 67, 100507 (2003) [4 pages]

Anomalous dissipation in the mixed state of underdoped cuprates close to the superconductor-insulator boundary
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C. Capan * and K. Behnia
Laboratoire de Physique Quantique (UPR 5 CNRS), ESPCI, 75231 Paris, France

Z. Z. Li and H. Raffy
Laboratoire de Physique des Solides (UMR 8502 CNRS), Université Paris-Sud, 91405 Orsay, France

C. Marin
DRFMC/SPSMS, Commisariat à l’Energie Atomique, 38042 Grenoble, France

Rapid Communication Received 17 December 2002; published 28 March 2003

We present a comparative study of Nernst effect and resistivity in underdoped samples of Bi2Sr2CuO6+δ and La2-xSrxCuO4. The Nernst effect presents a peak in a region of the H-T diagram where resistivity shows a nonmetallic temperature dependence. Our results illustrate that the mechanism of dissipation in the mixed state of underdoped cuprates is poorly understood. Large quantum superconducting fluctuations and vanishing vortex viscosity are among suggested explanations for an enhanced Nernst signal close to the superconductor-insulator boundary.


©2003 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v67/e100507
DOI: 10.1103/PhysRevB.67.100507
PACS: 74.72.-h, 74.25.Fy, 74.40.+k, 72.15.Jf

* Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.

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