Heat Transport in a Strongly Overdoped Cuprate: Fermi Liquid and a Pure d-Wave BCS Superconductor

Cyril Proust, Etienne Boaknin, RW Hill, Louis Taillefer, Andrew Peter Mackenzie

Research output: Contribution to journalArticlepeer-review

182 Citations (Scopus)

Abstract

The transport of heat and charge in the overdoped cuprate superconductor Tl2Ba2CuO6+δ 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.
Original languageEnglish
Article number147003
JournalPhysical Review Letters
Volume89
Issue number14
DOIs
Publication statusPublished - 30 Sept 2002

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