Angle-resolved photoemission observation of the superconducting-gap minimum and its relation to the nesting vector in the phonon-mediated superconductor YNi2 B2 C

T. Baba, Takayoshi Yokoya, S. Tsuda, T. Watanabe, Minoru Nohara, H. Takagi, T. Oguchi, S. Shin

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We have performed ultrahigh-resolution angle-resolved photoemission spectroscopy to directly study the large superconducting (SC) gap anisotropy of YNi2 B2 C. We succeed in measuring momentum (k) dependence of SC gap for individual Fermi surface (FS) sheets, which demonstrates complexity of SC gap in a phonon-mediated superconductor. Within measured k regions on FS sheets, we find a pointlike minimum of SC gap, whose k positions can be connected by the known nesting vector. This shows close correlation between the nesting vector and node formation.

Original languageEnglish
Article number180509
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number18
Publication statusPublished - May 17 2010


ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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