Direct observation of superconducting gaps in MgB2 by angle-resolved photoemission spectroscopy

S. Souma, Y. Machida, T. Sato, T. Takahashi, H. Matsui, S. C. Wang, H. Ding, A. Kaminski, J. C. Campuzano, S. Sasaki, K. Kadowaki

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

High-resolution angle-resolved photoemission spectroscopy has been carried out to clarify the anomalous superconductivity of MgB2. We observed three bands crossing the Fermi level, which are ascribed to B2p-σ, π and surface bands. We have succeeded for the first time in directly observing the superconducting gaps of these bands separately. We have found that the superconducting-gap sizes of σ and surface bands are 6.5 ± 0.5 and 6.0 ± 0.5 meV, respectively, while that of the π band is much smaller (1.5 ± 0.5 meV). The present experimental result unambiguously demonstrates the validity of the two-band superconductivity in MgB2.

Original languageEnglish
Pages (from-to)102-103
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume408-410
Issue number1-4
DOIs
Publication statusPublished - 2004 Aug 1
EventProceedings of the International Conference on Materials - Rio de Janeiro, Brazil
Duration: 2003 May 252003 May 30

Keywords

  • ARPES
  • MgB

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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    Souma, S., Machida, Y., Sato, T., Takahashi, T., Matsui, H., Wang, S. C., Ding, H., Kaminski, A., Campuzano, J. C., Sasaki, S., & Kadowaki, K. (2004). Direct observation of superconducting gaps in MgB2 by angle-resolved photoemission spectroscopy. Physica C: Superconductivity and its applications, 408-410(1-4), 102-103. https://doi.org/10.1016/j.physc.2004.02.054