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

Proust, Cyril; Boaknin, Etienne; Hill, R. W.; Taillefer, Louis; Mackenzie, A. P.

doi:10.1103/PhysRevLett.89.147003

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

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Citation

Proust, C., Boaknin, E., Hill, R. W., Taillefer, L., & Mackenzie, A. P. (2002). Heat Transport in a Strongly Overdoped Cuprate: Fermi Liquid and a Pure d-Wave BCS Superconductor. Physical Review Letters, 89(14): 147003, pp. 1-4. doi:10.1103/PhysRevLett.89.147003.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-EFB0-D

Abstract

The transport of heat and charge in the overdoped cuprate superconductor Tl2Ba2CuO6+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.