Superconducting transitions studied by ultrahigh-resolution photoemission

T. Yokoya, T. Kiss, A. Chainani, S. Shin

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Superconducting transitions of elemental metals and Ni borocarbides are studied using ultrahigh-resolution and low-temperature photoemission spectroscopy. Photoemission spectra of elemental metals (Nb and Pb) show the appearance of a sharp peak just below the Fermi level and a shift of the leading edge, indicating clear opening of the superconducting gap. Furthermore, Pb spectrum shows a dip and hump structure beyond the peak, characteristic of the strong-coupling superconductivity. On the other hand, comparative study of Y(Ni1-xPtx)2B2C (x=0.0 and 0.2) shows a difference in the slope of the leading edge, which can be explained in terms of a highly anisotropic s-wave gap in YNi2B2C, consistent to magnetic field dependent specific heat measurements. These observations demonstrate that photoemission spectroscopy is a useful and reliable technique to study electronic structures and phase transitions at very small energy scales.

Original languageEnglish
Article number4373
Pages (from-to)99-105
Number of pages7
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume124
Issue number2-3
DOIs
Publication statusPublished - Jan 1 2002
Externally publishedYes

Keywords

  • Anisotropic s-wave gap
  • Strong-coupling super-conductivity
  • Superconducting transition
  • Ultrahigh-resolution and low-temperature 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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