Superconductivity to 21 K in intermetallic thorium-based boride carbides

J. L. Sarrao, M. C. de Andrade, J. Herrmann, S. H. Han, Z. Fisk, M. B. Maple, R. J. Cava

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We report the observation of superconductivity in intermetallic thorium-based boride carbides. For ThM2B2C, superconducting Tc's of 6 K (M=Ni), 6.5 K (M=Pt), and 14.5 K (M=Pd) have been measured. These compounds are isostructural with the recently reported LnNi2B2C superconductors. We have also observed bulk superconductivity in an as-yet-undetermined thorium-palladium-boron-carbon quaternary phase at 21.5 K. Critical-field measurements on the two palladium-based superconductors, as well as the pressure dependence of Tc for the 21.5 K superconductor, are reported.

Original languageEnglish (US)
Pages (from-to)65-69
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue number1-2
StatePublished - Aug 1 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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