Tunneling spectroscopy of non-oxide perovskite superconductor MgCNi3

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

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume40
Issue number12 B
Publication statusPublished - 2001 Dec 15
Externally publishedYes

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Perovskite
Superconducting materials
Spectroscopy
Polycrystals
spectroscopy
Energy gap
Microscopes
polycrystals
Scanning
microscopes
scanning
Temperature

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Tunneling spectroscopy of non-oxide perovskite superconductor MgCNi3. / Kinoda, Go; Nishiyama, Masato; Zhao, Yong; Murakami, Masato; Koshizuka, Naoki; Hasegawa, Tetsuya.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 40, No. 12 B, 15.12.2001.

Research output: Contribution to journalArticle

Kinoda, G, Nishiyama, M, Zhao, Y, Murakami, M, Koshizuka, N & Hasegawa, T 2001, 'Tunneling spectroscopy of non-oxide perovskite superconductor MgCNi3', Japanese Journal of Applied Physics, Part 2: Letters, vol. 40, no. 12 B.
Kinoda, Go ; Nishiyama, Masato ; Zhao, Yong ; Murakami, Masato ; Koshizuka, Naoki ; Hasegawa, Tetsuya. / Tunneling spectroscopy of non-oxide perovskite superconductor MgCNi3. In: Japanese Journal of Applied Physics, Part 2: Letters. 2001 ; Vol. 40, No. 12 B.
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