The Fermi surface and sheet-dependent superconducting gap of MgB 2

S. Tsuda; T. Yokoya; S. Shin; Y. Takano; H. Kito; A. Matsushita; F. Yin; J. Itoh; H. Harima

doi:10.1016/j.physc.2004.01.037

The Fermi surface and sheet-dependent superconducting gap of MgB ₂

S. Tsuda, T. Yokoya, S. Shin, Y. Takano, H. Kito, A. Matsushita, F. Yin, J. Itoh, H. Harima

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

3 Citations (Scopus)

Abstract

The Fermi surface and superconducting gap of MgB₂ have been studied by angle-resolved photoemission spectroscopy. Two Fermi surfaces composed of the σ band and the π band are clearly observed without contaminated by the "surface-derived" band. The high-resolution photoemission spectra show that superconducting gaps with values of 5.5 and 2.2 meV open on the σ band and the π band, respectively, both of which close at the bulk transition temperature (T_c). This result provides an experimental evidence for the two-band superconductivity on MgB₂ and, moreover, validates the role of momentum-dependent electron-phonon coupling as the origin of multiple-gap superconductivity as well as the high transition temperature (T_c) of MgB₂.

Original language	English
Pages (from-to)	36-40
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	412-414
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physc.2004.01.037
Publication status	Published - Oct 2004
Externally published	Yes

Keywords

MgB
Photoemission
Superconducting gap

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "The Fermi surface and sheet-dependent superconducting gap of MgB 2",

abstract = "The Fermi surface and superconducting gap of MgB2 have been studied by angle-resolved photoemission spectroscopy. Two Fermi surfaces composed of the σ band and the π band are clearly observed without contaminated by the {"}surface-derived{"} band. The high-resolution photoemission spectra show that superconducting gaps with values of 5.5 and 2.2 meV open on the σ band and the π band, respectively, both of which close at the bulk transition temperature (Tc). This result provides an experimental evidence for the two-band superconductivity on MgB2 and, moreover, validates the role of momentum-dependent electron-phonon coupling as the origin of multiple-gap superconductivity as well as the high transition temperature (Tc) of MgB2.",

keywords = "MgB, Photoemission, Superconducting gap",

author = "S. Tsuda and T. Yokoya and S. Shin and Y. Takano and H. Kito and A. Matsushita and F. Yin and J. Itoh and H. Harima",

note = "Funding Information: This work was supported by a Grant-in-aid from the Ministry of Education, Science, and Culture of Japan. S.T. thanks the Japan Society for the Promotion of Science for financial support.",

year = "2004",

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doi = "10.1016/j.physc.2004.01.037",

language = "English",

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pages = "36--40",

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T1 - The Fermi surface and sheet-dependent superconducting gap of MgB 2

AU - Tsuda, S.

AU - Yokoya, T.

AU - Shin, S.

AU - Takano, Y.

AU - Kito, H.

AU - Matsushita, A.

AU - Yin, F.

AU - Itoh, J.

AU - Harima, H.

N1 - Funding Information: This work was supported by a Grant-in-aid from the Ministry of Education, Science, and Culture of Japan. S.T. thanks the Japan Society for the Promotion of Science for financial support.

PY - 2004/10

Y1 - 2004/10

N2 - The Fermi surface and superconducting gap of MgB2 have been studied by angle-resolved photoemission spectroscopy. Two Fermi surfaces composed of the σ band and the π band are clearly observed without contaminated by the "surface-derived" band. The high-resolution photoemission spectra show that superconducting gaps with values of 5.5 and 2.2 meV open on the σ band and the π band, respectively, both of which close at the bulk transition temperature (Tc). This result provides an experimental evidence for the two-band superconductivity on MgB2 and, moreover, validates the role of momentum-dependent electron-phonon coupling as the origin of multiple-gap superconductivity as well as the high transition temperature (Tc) of MgB2.

AB - The Fermi surface and superconducting gap of MgB2 have been studied by angle-resolved photoemission spectroscopy. Two Fermi surfaces composed of the σ band and the π band are clearly observed without contaminated by the "surface-derived" band. The high-resolution photoemission spectra show that superconducting gaps with values of 5.5 and 2.2 meV open on the σ band and the π band, respectively, both of which close at the bulk transition temperature (Tc). This result provides an experimental evidence for the two-band superconductivity on MgB2 and, moreover, validates the role of momentum-dependent electron-phonon coupling as the origin of multiple-gap superconductivity as well as the high transition temperature (Tc) of MgB2.

KW - MgB

KW - Photoemission

KW - Superconducting gap

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DO - 10.1016/j.physc.2004.01.037

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