Angle-resolved photoemission observation of the superconducting-gap minimum and its relation to the nesting vector in the phonon-mediated superconductorYNi2B2C | Zendy

Tetsuya Baba | Zendy; T. Yokoya | Zendy; S. Tsuda | Zendy; Tomonori Watanabe | Zendy; M. Nohara | Zendy; H. Takagi | Zendy; Tamio Oguchi | Zendy; Shik Shin | Zendy

Open Access

Angle-resolved photoemission observation of the superconducting-gap minimum and its relation to the nesting vector in the phonon-mediated superconductorYNi2B2C

Author(s) -

Tetsuya Baba,

T. Yokoya,

S. Tsuda,

Tomonori Watanabe,

M. Nohara,

H. Takagi,

Tamio Oguchi,

Shik Shin

Publication year - 2010

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.81.180509

Subject(s) - superconductivity , physics , condensed matter physics , anisotropy , angle resolved photoemission spectroscopy , photoemission spectroscopy , phonon , fermi surface , nesting (process) , fermi gamma ray space telescope , momentum (technical analysis) , materials science , electronic structure , quantum mechanics , spectral line , metallurgy , finance , economics

We have performed ultrahigh-resolution angle-resolved photoemission spectroscopy to directly study the large superconducting (SC) gap anisotropy of YNi₂B₂C. 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

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