Bulk superconducting gap of V3Si studied by low-energy ultrahigh-resolution photoemission spectroscopy

T. Sato, S. Souma, K. Nakayama, K. Sugawara, Naoki Toyota, T. Takahashi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We have performed low-energy ultrahigh-resolution photoemission spectroscopy (PES) of A15 compound V3Si with a xenon-plasma discharge lamp to elucidate the bulk superconducting gap. Below the superconducting transition temperature (Tc = 15.9 K), we found a sharp quasiparticle peak at the Fermi level in the PES spectrum. The gap spectrum is well fitted by a single s-wave superconducting-gap function together with a dip structure at ∼30 meV suggestive of a strong electron-phonon coupling. The anomalous in-gap state previously observed in the PES measurement with high-energy photons is absent or negligibly small in the present bulk-sensitive measurement. The present PES result shows that V3Si is a single-gap s-wave superconductor.

Original languageEnglish
Pages (from-to)40-42
Number of pages3
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume208
DOIs
Publication statusPublished - 2016 Apr 1

Keywords

  • A15 compounds
  • Low-T superconductor
  • Photoemission spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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