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Temperature dependence of resitivity, p(T), thermopower, S300, superconducting transition temperature, 71, and lower critical field, Η ι(0), of dicherently doped REBa2 Cu3 O7x ceramics have been measured. The hole doping of the CuO 2 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 p(T) curves of REBa2 Cu3 O 7-x ckpounds. Some observed features of the p(T) dependence are predicted by mean field phase diagram for the CuO2 plane.

Properties of Normal and Superconducting States of Differently Doped REBa2Cu3O7-x

Properties of Normal and Superconducting States of Differently Doped REBa₂Cu₃O_7-x