Electronic transport in highly doped La2−xSrxCuO4 superconductors
C. Uher, A. B. Kaiser, E. Gmelin, L. Walz
DOI 10.1103/PhysRevB.36.5676 · Physical Review B
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Abstract
The thermoelectric power, Hall coefficient, and resistivity have been measured on two samples of La2−xSrxCuO4 with a strontium content of x=0.2 and x=0.25. We observe typical metallic behavior with a strong electron-phonon interaction and a low density of carriers. A large positive peak at a temperature of more than twice the respective superconducting transition temperature suggests a strong phonon-drag contribution to the thermopower. At higher temperatures the thermopower changes sign from positive to negative, a trend that increases with increasing Sr content. A positive Hall coefficient combined with a negative diffusion thermopower implies the presence of more than one type of carrier.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.8Sr0.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure unresolved | onset |
| La1.75Sr0.25CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure unresolved | onset |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
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