Test of the Wiedemann-Franz law in an optimally-doped cuprate

Details Test of the Wiedemann-Franz law in an optimally-doped cuprate Test of the Wiedemann-Franz law in an optimally-doped cuprate

2003-04-04

arxiv.org/abs/cond-mat/0304111v3

Phys. Rev. Lett. 92, 177003 (2004)

Physics

Condensed Matter

Superconductivity

Final published version

Scientific paper

10.1103/PhysRevLett.92.177003

We present a study of heat and charge transport in Bi$_{2+x}$Sr$_{2-x}$CuO$_{6+\delta}$ focused on the size of the low-temperature linear term of the thermal conductivity at optimal doping level. In the superconducting state, the magnitude of this term implies a d-wave gap with an amplitude close to what has been reported. In the normal state, recovered by the application of a magnetic field, measurement of this term and residual resistivity yields a Lorenz number $L = \kappa_{N}\rho_{0}/T = 1.3 \pm 0.2 L_{0}$. The departure from the value expected by the Wiedemann-Franz law is thus slightly larger than our estimated experimental resolution.

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