Superconducting symmetry studied from impurity effects in single-crystal Fe1-yMySe0.3Te0.7 (M = Co, Ni, Zn)

Takuya Inabe, Takayuki Kawamata, Takashi Noji, Tadashi Adachi, Yoji Koike

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13 Citations (Scopus)

Abstract

We have investigated the suppression of the superconducting transition temperature, Tc, with an increase of the residual resistivity, ρ0, through the substitution of M (M = Co, Ni, Zn) for Fe in Fe1-yMySe0.3Te0.7 single crystals, in order to clarify the symmetry of the superconducting gap in FeSe1-xTe x. Small, large and very small suppression of Tc have been observed through the Co, Ni, and Zn substitution, respectively. The magnitude of the suppression rate is hardly explained in terms of the pair-breaking effect due to potential scattering calculated based on the Abrikosov- Gor'kov theory, even if errors in the estimation of the carrier concentration, effective mass and ρ0 were taken into account. Accordingly, these results suggest that the superconducting symmetry is the s++-wave in FeSe 1-xTex.

Original languageEnglish
Article number044712
Journaljournal of the physical society of japan
Volume82
Issue number4
DOIs
Publication statusPublished - 2013 Apr

Keywords

  • Fe-based superconductor
  • Impurity effect
  • Residual resistivity
  • Superconducting symmetry
  • Superconducting transition temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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