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 journalArticlepeer-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 (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.

Original languageEnglish
Pages (from-to)36-40
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume412-414
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - Oct 2004
Externally publishedYes

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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