Resistive transition behavior of impurity-doped YBa2Cu3O7 type superconductors

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Abstract

Critical behavior in resistivity above Tc for several impurity-doped YBa2Cu3O7 type superconductors was investigated. These include 1) oxygen-controlled YBa2Cu3O7−y, 2) YBa2(Cu1−xZnx)3O7, 3) La1−zPrzBa2Cu3O7 and 4) Agp (YBa2Cu3O7)1−p composites. The experimental data were analyzed in terms of a power law following the Aslamazov-Larkin theory. The amplitude CF of the power law changes systematically with increasing dopant level: CF increases with y or z while it decreases with x or p. We discuss roles of the dopant for each system in the fluctuation regime.

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