Anomalous superconducting-gap symmetry of noncentrosymmetric La2 C3 observed by ultrahigh-resolution photoemission spectroscopy

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Abstract

We have performed ultrahigh-resolution photoemission spectroscopy on noncentrosymmetric superconductor La2 C3 to study the electronic structure near the Fermi level (EF) and the superconducting-gap symmetry. We clearly observed the opening of the superconducting gap, as evidenced by the emergence of a sharp quasiparticle peak just below EF together with the leading-edge shift toward higher binding energy. Quantitative analysis of the gap function has revealed a marked deviation from the single s - or d -wave symmetry, suggesting the existence of multiple superconducting gaps.

Original languageEnglish
Article number132512
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number13
DOIs
Publication statusPublished - 2007 Oct 30

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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