Dispersive gap mode of phonons in anisotropic superconductors

Masanori Ichioka, Kazushige Machida

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We estimate the effect of the superconducting gap anisotropy in the dispersive gap mode of phonons, which is observed by the neutron scattering on borocarbide superconductors. We numerically analyze the phonon spectrum considering the electron-phonon coupling, and examine contributions coming from the gap suppression and the sign change of the pairing function on the Fermi surface. When the sign of the pairing function is changed by the nesting translation, the gap mode does not appear. We also discuss the suppression of the phonon softening of the Kohn anomaly due to the onset of superconductivity. We demonstrate that observation of the gap dispersive mode is useful for sorting out the underlying superconducting pairing function.

Original languageEnglish
Pages (from-to)2064-2070
Number of pages7
Journaljournal of the physical society of japan
Volume72
Issue number8
DOIs
Publication statusPublished - Aug 2003

Keywords

  • Anisotropic superconducting gap
  • Borocarbide
  • Electron-phonon coupling
  • Gap mode in phonons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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