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Heat transport in a strongly overdoped cuprate: Fermi liquid and a pure d-wave BCS superconductor.

Authors
  • Proust, Cyril
  • Boaknin, Etienne
  • Hill, R W
  • Taillefer, Louis
  • Mackenzie, A P
Type
Published Article
Journal
Physical review letters
Publication Date
Sep 30, 2002
Volume
89
Issue
14
Pages
147003–147003
Identifiers
PMID: 12366068
Source
Medline
License
Unknown

Abstract

The transport of heat and charge in the overdoped cuprate superconductor Tl(2)Ba2CuO(6+delta) was measured down to low temperature. In the normal state, obtained by applying a magnetic field greater than the upper critical field, the Wiedemann-Franz law is verified to hold perfectly. In the superconducting state, a large residual linear term is observed in the thermal conductivity, in quantitative agreement with BCS theory for a d-wave superconductor. This is compelling evidence that the electrons in overdoped cuprates form a Fermi liquid, with no indication of spin-charge separation.

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