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APS » Journals » Phys. Rev. Lett. » Volume 88 » Issue 25
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Phys. Rev. Lett. 88, 257003 (2002) [4 pages]

High Field Phase Diagram of Cuprates Derived from the Nernst Effect

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Yayu Wang1, N. P. Ong1, Z. A. Xu1,*, T. Kakeshita2, S. Uchida2, D. A. Bonn3, R. Liang3, and W. N. Hardy3
1Department of Physics, Princeton University, Princeton, New Jersey 08544
2School of Frontier Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
3Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

Received 30 January 2002; published 7 June 2002

Measurements of the Nernst signal in the vortex-liquid state of the cuprates to high fields (33 T) reveal that vorticity extends to very high fields even close to the zero-field critical temperature Tc0. In overdoped La2-xSrxCuO4, we show that the upper critical field Hc2(T) curve does not end at Tc0, but at a much higher temperature. These results imply that Tc0 corresponds to a loss in phase rigidity rather than a vanishing of the pairing amplitude. An intermediate field H*(T)≪Hc2(T) is shown to be the field scale for the flux-flow resistivity.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.257003
DOI:
10.1103/PhysRevLett.88.257003
PACS:
74.40.+k, 72.15.Jf, 74.25.Fy, 74.72.-h

*Present address: Department of Physics, Zhejiang University, Hangzhou, China.

 
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