Raman scattering measurement of the superconducting gap character in MgB2 single crystals

J. W. Quilty, S. Lee, A. Yamamoto, S. Tajima

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Polarisation-resolved Raman scattering on MgB2 single crystals reveals a sharp pair-breaking peak, which appears in the electronic continuum below Tc. This peak reaches an average maximum Raman shift of 105±1 cm-1 (2Δ(0)/kBTc = 4.0 ± 0.1) and shows a small anisotropy of 2-5 cm-1 as a function of polarisation. The temperature dependence follows that predicted from BCS theory and we find no evidence of a second gap feature below 2Δ. We conclude that the temperature dependence, polarisation dependence and magnitude of the superconducting gap observed by Raman scattering are consistent with a slightly anisotropic s-wave gap in a conventional BCS superconductor.

Original languageEnglish
Pages (from-to)38-42
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - 2002 Oct 1
Externally publishedYes

Keywords

  • MgB
  • Raman spectroscopy
  • Superconducting gap

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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