Tunneling spectroscopy of non-oxide perovskite superconductor MgCNi3

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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 [Gamma];. The value of the superconducting gap [Delta] is estimated to be 1.10-1.15 meV at 3 K, resulting in a ratio of 2[Delta]/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.
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Zhao, Yong
Kinoda, Go
Nishiyama, Masato
Murakami, M
Koshizuka, N
Hasegawa, Tetsuya
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Publication Year
2001
Resource Type
Journal Article
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UNSW Faculty