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Annealing and Strain Effects on Tl-Ba-Ca-Cu-O Crystals and Ceramics

  • E. L. Venturini (a1), B. Morosin (a1), D. S. Ginley (a1), J. F. Kwak (a1), J. E. Schirber (a1), R. J. Baughman (a1) and R. A. Graham (a1)...

Abstract

Superconducting transition temperatures (Tc'S) in the Tl-Ba-Ca-Cu-O system are shown to be a function of processing for both single crystals and bulk ceramics. Crystals with the identical structural phase and nominal composition but slightly different lattice constants can have significant differences in Tc. We report the effects of high temperature annealing in vacuum or flowing oxygen on Tc for single crystal plates of two common phases with nominal stochiometries Tl2Ba2Ca1Cu2O8 and Tl2Ba2Ca2Cu3O10. Contradictory results on nominally similar crystals suggest that strain, Tl content and TI/Ca site disorder are as important as the oxygen stoichiometry in determining Tc This interpretation is supported by complementary annealing studies in bulk ceramic, including a powder where Tc increased by 5 K following high-pressure shock loading which introduced substantial residual strain.

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