Heat transport in a strongly overdoped cuprate: Fermi liquid and a pure d-wave BCS superconductor |
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Authors: | Proust Cyril Boaknin Etienne Hill R W Taillefer Louis Mackenzie A P |
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Institution: | Canadian Institute for Advanced Research, Department of Physics, University of Toronto, Toronto, Ontario, Canada. |
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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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