Test of the Wiedemann-Franz Law in an Optimally Doped Cuprate
Romain Bel, Kamran Behnia, Cyril Proust, Peter van der Linden, Duncan Maude, Sergey I. Vedeneev
DOI 10.1103/PhysRevLett.92.177003 · Physical Review Letters
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Abstract
We present a study of heat and charge transport in Bi2+xSr2−xCuO6+δ 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=κNρ0/T=1.3±0.2L0. The departure from the value expected by the Wiedemann-Franz law is thus slightly larger than our estimated experimental resolution.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2+xSr2-xCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.5 | Pressure not reported | onset |
| Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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