Tunneling spectroscopy of the superconducting energy gap

Toshikazu Ekino, Hironobu Fujii, Makoto Kosugi, Yuji Zenitani, Jun Akimitsu

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

Superconducting energy gap in (Formula presented) has been investigated using a break-junction tunneling technique. The observed differential conductance (Formula presented) is well described by the BCS density of states with a small lifetime broadening parameter. We have found small gap values for the local low-(Formula presented) phases in addition to the bulk (Formula presented) of 15.6-16.6 K. The gap value of (Formula presented) meV with (Formula presented) K gives the BCS ratio of (Formula presented), which is kept constant down to the observed lowest (Formula presented) of 4.6 K. These results give clear evidence for the BCS mechanism of superconductivity for these compounds.

Original languageEnglish
Pages (from-to)5640-5649
Number of pages10
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number9
DOIs
Publication statusPublished - Jan 1 1996
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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