New Pb-Based Cuprates with 1222 Structure Having No Tetravalent Ions, (Pb0.5Cu0.5)Sr2-xLn2-yLax+yCu2Oz (Ln: Gd, Dy, Ho and Er)

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Copyright (c) 1992 The Japan Society of Applied Physics
, , Citation Hiroyuki Sasakura et al 1992 Jpn. J. Appl. Phys. 31 L25 DOI 10.1143/JJAP.31.L25

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Author affiliations

1 Department of Materials Science, University of Osaka Prefecture, Sakai, Osaka 591

2 Materials and Devices Laboratory, Mitsubishi Electric Corporation, Sagamihara, Kanagawa 229

Dates

  1. Received 5 November 1991
  2. Accepted 16 November 1991

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1347-4065/31/1A/L25

Abstract

New Pb-based cuprates with 1222 structure have been synthesized in (Pb0.5Cu0.5)Sr2-xLn2-yLax+yCu2Oz (Ln:Gd, Dy, Ho and Er) systems having no tetravalent ions such as Ce4+ and Pr4+. The composition to obtain an almost-single phase sample for each system was found to be located within a narrow limited region. After oxygen annealing at 500°C for 100 h under partial pressure of 100 atm, all the almost-single-phase samples were semiconductors, but a sample with the nominal composition of (Pb0.5Cu0.5)Sr1.45Gd1.95La0.60Cu2Oz among them showed a diamagnetic signal starting from about 20 K.

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10.1143/JJAP.31.L25