Abstract
Transport properties of a series of Bi 3.9Sr 3.3Ca 1.3(Cu 1− n Fe n ) 3O x ( n = 0-0.05) glasses containing two different transition metal ions have been reported. The d.c. conductivity data of the as quenched glasses are explained by the “small polaron” hopping conduction mechanism. All these glasses become superconductors by annealing them at an optimum temperature 840°C for 40 h in air. The superconducting transition temperatures ( T c ) vary between 78 and 60 K depending on Fe concentration. The maximum zero resistance temperature T c0 (= 40 K obtained for n = 0) consistently decreases with increase in the Fe content. This behavior is consistent with the pair breaking mechanism. The Seebeck coefficient ( S) of the crystalline superconductors showed nonlinear thermal variation which was explained by phonon drag effect.
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