Tunneling spectroscopy of non-oxide perovskite superconductor MgCNi3

Go Kinoda, Masato Nishiyama, Yong Zhao, Masato Murakami, Naoki Koshizuka, Tetsuya Hasegawa

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12 Citations (Scopus)


We report the tunneling spectroscopy of non-oxide perovskite superconductor MgCNi3 polycrystals using a low-temperature scanning tunneling microscope. The obtained tunneling spectra clearly show a superconducting energy gap structure, which can be well fitted by the BCS function with smearing parameter Γ. The value of the superconducting gap Δ is estimated to be 1.10-1.15 meV at 3 K, resulting in a ratio of 2Δ/kBTc = 3.3-3.4 for Tc of 7.8 K. This result suggests that MgCNi3 is a conventional BCS s-wave superconductor in the weak-coupling regime.

Original languageEnglish
Pages (from-to)L1365-L1366
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number12 B
Publication statusPublished - 2001 Dec 15
Externally publishedYes


  • Energy gap
  • Local density of states
  • MgCNi
  • Superconductor
  • Tunneling spectroscopy

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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