Tunneling spectroscopy of non-oxide perovskite superconductor MgCNi3

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

doi:10.1143/jjap.40.l1365

Tunneling spectroscopy of non-oxide perovskite superconductor MgCNi₃

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

研究成果: Article › 査読

12 被引用数 (Scopus)

抄録

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/k_BT_c = 3.3-3.4 for T_c of 7.8 K. This result suggests that MgCNi₃ is a conventional BCS s-wave superconductor in the weak-coupling regime.

本文言語	English
ページ（範囲）	L1365-L1366
ジャーナル	Japanese Journal of Applied Physics, Part 2: Letters
巻	40
号	12 B
DOI	https://doi.org/10.1143/jjap.40.l1365
出版ステータス	Published - 2001 12月 15
外部発表	はい

ASJC Scopus subject areas

工学（全般）
物理学および天文学（全般）

文献へのアクセス

10.1143/jjap.40.l1365

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引用スタイル

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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 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.",

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AU - Koshizuka, Naoki

AU - Hasegawa, Tetsuya

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