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

Research output: Contribution to journal › Article › peer-review

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/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.

Original language	English
Pages (from-to)	L1365-L1366
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	40
Issue number	12 B
DOIs	https://doi.org/10.1143/jjap.40.l1365
Publication status	Published - 2001 Dec 15
Externally published	Yes

Keywords

Energy gap
Local density of states
MgCNi
Superconductor
Tunneling spectroscopy

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/jjap.40.l1365

Cite this

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title = "Tunneling spectroscopy of non-oxide perovskite superconductor MgCNi3",

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.",

keywords = "Energy gap, Local density of states, MgCNi, Superconductor, Tunneling spectroscopy",

author = "Go Kinoda and Masato Nishiyama and Yong Zhao and Masato Murakami and Naoki Koshizuka and Tetsuya Hasegawa",

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T1 - Tunneling spectroscopy of non-oxide perovskite superconductor MgCNi3

AU - Kinoda, Go

AU - Nishiyama, Masato

AU - Zhao, Yong

AU - Murakami, Masato

AU - Koshizuka, Naoki

AU - Hasegawa, Tetsuya

PY - 2001/12/15

Y1 - 2001/12/15

N2 - 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.

AB - 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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