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

Bel, R.; Behnia, K.; Proust, C.; van der Linden, P.; Maude, D.; Vedeneev, S. I.

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

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van der Linden, P.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Maude, D.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Vedeneev, S. I.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Bel, R., Behnia, K., Proust, C., van der Linden, P., Maude, D., & Vedeneev, S. I. (2004). Test of the Wiedemann-Franz law in an optimally doped cuprate. Physical Review Letters, 92(17): 177003.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F6E5-A

Abstract

We present a study of heat and charge transport in Bi2+xSr2-xCuO6+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(Nrho0)/T=1.3+/-0.2L(0). The
departure from the value expected by the Wiedemann-Franz law is thus
slightly larger than our estimated experimental resolution.