High-temperature resistance behavior of Bi2Sr2CaCu2O8+y and YBa2Cu3O7-x superconductors

Bansal, T. K.; Bansal, Sadhana; McGreevy, R. L.; Smith, S. H.; Garton, G.
November 1988
Applied Physics Letters;11/21/1988, Vol. 53 Issue 21, p2093
Academic Journal
High- and low-temperature resistance measurements have been carried out on Bi2Sr2CaCu2O8+y and YBa2Cu3O7-x in air and in vacuum. Both the ceramics exhibit a significant change in oxygen content during annealing between 350 and 450 °C. The Bi2Sr2CaCu2O8+y sample exhibits an increase in resistance with increased oxygen content resulting in deterioration of superconductivity, whereas YBa2Cu3O7-x shows improvement in superconducting behavior with increase in oxygen content. Consequently Bi2Sr2CaCu2O8+y prepared by fast cooling from the sintering temperature possesses a higher Tc , whereas slow cooling of YBa2Cu3O7-x produces a higher Tc .


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