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 articlepeer-review

2 Citations (Scopus)


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
Issue number1-4
Publication statusPublished - 2004 Aug
EventProceedings of the International Conference on Materials - Rio de Janeiro, Brazil
Duration: 2003 May 252003 May 30


  • MgB


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