Superconductivity above 90 K in magnetic rare earth-barium-copper oxides

J. O. Willis, Z. Fisk, J. D. Thompson, S. W. Cheong, R. M. Aikin, J. L. Smith, E. Zirngibl

Research output: Contribution to journalLetterpeer-review

110 Scopus citations

Abstract

We report measurements of the superconducting and magnetic behavior of GdBa2Cu3Ox. Superconductivity occurs below Tc = 95 and 93 K, respectively, for these compounds with large Meissner effects observed. The Gd-based compound has an upper critical field slope -dHc2 dT greater than 1.2 T/K. Both compounds exhibit Curie-Weiss behavior above Tc with free-ion effective moments and small, negative temperature intercepts. In addition, the Gd-based compound orders antiferromagnetically below 2.24 K with an entropy consistent with the ordering of seven unpaired spins.

Original languageEnglish (US)
Pages (from-to)L139-L142
JournalJournal of Magnetism and Magnetic Materials
Volume67
Issue number2
DOIs
StatePublished - Jun 1987

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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