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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.
