High transition temperature superconductor LaBa2Cu3O7−y with zero resistance at 92 K

6 June 1988

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 52 (23) , 1989-1991
https://doi.org/10.1063/1.99744

Abstract

Samples of LaBa₂ Cu₃ O_7−y have been synthesized, which show a superconducting transition above 90 K. One of the samples shows a superconducting transition with an onset at 93 K and a zero resistivity at 92 K. These temperatures are the highest among those reported so far on this system and even higher than those in YBa₂ Cu₃ O_7−y. The magnetic susceptibility measurement also shows that it has a superconducting transition with onset at around 93 K. To synthesize such good LaBa₂ Cu₃ O_7−y requires two important procedures. First is sintering above 950 °C in N₂ gas atmosphere and the second is annealing at 300 °C in dried O₂ gas atmosphere.

Keywords

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