Properties of Normal and Superconducting States of Differently Doped REBa2Cu3O7-x |
| C. Sułkowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wrocław, Poland |
| Received: January 5, 1995; revised version: May 25, 1995 |
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| Temperature dependence of resitivity, ρ(T), thermopower, S300, superconducting transition temperature, Tc, and lower critical field, Ηc1(0), of differently doped REBa2Cu3O7-x ceramics have been measured. The hole doping of the CuO2 plane is determined by the Tc, the oxygen concentration and/or the value of the thermopower. The temperature dependence of the resistivity above 200 K and the values of the lower critical field Hc1(0) show clear dependence on the hole concentration. Below 200 K, in contrast to simple metals, the resitivity of all samples decreases faster than linearly with the decreasing temperature. Classical electron-phonon scattering mechanism is not appropriate to describe the ρ(T) curves of REBa2Cu3O7-x compounds. Some observed features of the ρ(T) dependence are predicted by mean field phase diagram for the CuO2 plane. |
| DOI: 10.12693/APhysPolA.88.375 PACS numbers: 74.72.-h, 74.25.Fy |