Carbon concentration dependence of the superconducting transition temperature and structure of MgCxNi3

T. G. Amos, Q. Huang, J. W. Lynn, T. He, R. J. Cava

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Abstract

The crystal structure of the superconductor MgCxNi3 is reported as a function of carbon concentration determined by powder neutron diffraction. The single-phase perovskite structure was found in only a narrow range of carbon content, 0.88 < x < 1.0. The superconducting transition temperature was found to decrease systematically with decreasing carbon concentration. The introduction of carbon vacancies has a significant effect on the positions of the Ni atoms. No evidence for long-range magnetic ordering was seen by neutron diffraction for carbon stoichiometries within the perovskite phase stability range.

Original languageEnglish (US)
Pages (from-to)73-77
Number of pages5
JournalSolid State Communications
Volume121
Issue number2-3
DOIs
StatePublished - Jan 2 2002

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Keywords

  • A. Superconductors
  • E. Neutron scattering

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