Abstract
Stable, reproducible high temperature superconductivity with onset temperatures of 90 K and above is confirmed in the oxide system with nominal metal ion composition BiSrCaCu2O x . The onset is nearly the same, but zero-resistance temperatures depend on the heat treatment. Sample quenched from 850 C in air (close to melting) to liquid nitrogen temperature is non-superconducting. BiSr0.5Ca1.5Cu2O x is also found to be superconducting in which a two-step drop in resistance is observed, one starting around 118 K and the other around 80 K.
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Tomy, C.V., Malik, S.K., Prasad, R. et al. High temperature superconductivity in Bi-Sr-Ca-Cu-O oxide system. Pramana - J. Phys. 30, L473–L476 (1988). https://doi.org/10.1007/BF02935605
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DOI: https://doi.org/10.1007/BF02935605