The suppression of superconductivity in MgCNi3 by Ni-site doping

M. A. Hayward, M. K. Haas, A. P. Ramirez, T. He, K. A. Regan, N. Rogado, K. Inumaru, R. J. Cava

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The effects of partial substitution of Cu and Co for Ni in the intermetallic perovskite superconductor MgCNi3 are reported. Calculation of the expected electronic density of states suggests that electron (Cu) and hole (Co) doping should have different effects. For MgCNi3-xCux, solubility of Cu is limited to approximately 3% (x = 0.1). and Tc decreases systematically from 7 to 6 K. For MgCNi3-xCox, solubility of Co is much more extensive, but bulk superconductivity disappears for Co doping of 1% (x = 0.03). No signature of long range magnetic ordering is observed in the magnetic susceptibility of the Co doped material.

Original languageEnglish (US)
Pages (from-to)491-495
Number of pages5
JournalSolid State Communications
Issue number8-9
StatePublished - Aug 21 2001

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry


  • A. Metals
  • A. Superconductors
  • D. Electronic band structure


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