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.
|ジャーナル||Japanese Journal of Applied Physics, Part 2: Letters|
|出版物ステータス||Published - 2001 12 15|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)