Bulk Superconductivity at 125 K in Tl2Ca2Ba2Cu3Ox

S. S. P. Parkin, V. Y. Lee, E. M. Engler, A. I. Nazzal, T. C. Huang, G. Gorman, R. Savoy, and R. Beyers
Phys. Rev. Lett. 60, 2539 – Published 13 June 1988
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Abstract

Bulk superconductivity is reported in Tl2Ca2Ba2 Cu3Ox with a transition to zero resistance at ≃ 125 K, the highest transition temperature (Tc) yet found. Transmission electron spectroscopy shows that the unit cell is body-centered tetragonal and contains trilayer Cu perovskitelike units separated by bilayer Tl-O units. Tc in this material varies from 118 to 125 K depending on preparation conditions. A high density of perovskitelike bilayer intergrowths are observed in the 118-K material, which we speculate result in the decreased Tc. A second structure containing only bilayer perovskitelike units—Tl2Ca1Ba2Cu2Ox—is a bulk superconductor with Tc ranging from 95 to 108 K.

  • Received 14 March 1988

DOI:https://doi.org/10.1103/PhysRevLett.60.2539

©1988 American Physical Society

Authors & Affiliations

S. S. P. Parkin, V. Y. Lee, E. M. Engler, A. I. Nazzal, T. C. Huang, G. Gorman, R. Savoy, and R. Beyers

  • Almaden Research Center, IBM Research Division, San Jose, California 95120

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Vol. 60, Iss. 24 — 13 June 1988

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