(Tl, Pb, Bi)Sr2Ca2Cu3Oz superconductors with zero resistance at 120 K

26 March 1990

journal article
conference paper
Published by AIP Publishing in Applied Physics Letters

Vol. 56 (13) , 1281-1283
https://doi.org/10.1063/1.103174

Abstract

We have synthesized new superconductors of nearly single phase with zero‐resistance temperatures around 120 K employing a novel method for sintering. The samples included a nominal composition of (Tl_0.64Pb_0.2Bi_0.16)Sr₂Ca₃Cu₄O_z. This sample was prepared from the mixture of presynthesized (Tl_0.64Pb_0.2Bi_0.16)Sr₂CaCu₂O_z (1212 phase), CaO, and CuO powders. The mixed powder was sintered at 920 °C in O₂ gas and post‐annealed at 400–600 °C in O₂ gas. The powder x‐ray diffraction revealed that the sample was isostructural with the Tl‐based (Tl, Pb, Bi)Sr₂Ca₂Cu₃O_z (1223 phase). The sample exhibited a sharp superconducting transition at T^onset_c=125 K and T^R=0_c=120 K and the superconducting diamagnetic signal at 10 K was about 20% of a full Meissner effect.

Keywords

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