Superconductivity pairing mechanism from cobalt impurity doping in FeSe: Spin (s±) or orbital (s++) fluctuation SUPERCONDUCTIVITY PAIRING MECHANISM from COBALT ⋯ T. URATA et al.

T. Urata, Y. Tanabe, K. K. Huynh, Y. Yamakawa, H. Kontani, K. Tanigaki

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

In high-superconducting transition temperature (Tc) iron-based superconductors, interband sign reversal (s±) and sign preserving (s++) s-wave superconducting states have been primarily discussed as the plausible superconducting mechanism. We study Co impurity scattering effects on the superconductivity in order to achieve an important clue on the pairing mechanism using single-crystal Fe1-xCoxSe and depict a phase diagram of a FeSe system. Both superconductivity and structural transition/orbital order are suppressed by the Co replacement on the Fe sites and disappear above x = 0.036. These correlated suppressions represent a common background physics behind these physical phenomena in the multiband Fermi surfaces of FeSe. By comparing experimental data and theories so far proposed, the suppression of Tc against the residual resistivity is shown to be much weaker than that predicted in the case of general sign reversal and full gap s± models. The origin of the superconducting paring in FeSe is discussed in terms of its multiband electronic structure.

Original languageEnglish
Article number014507
JournalPhysical Review B
Volume93
Issue number1
DOIs
Publication statusPublished - 2016 Jan 12

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Superconductivity pairing mechanism from cobalt impurity doping in FeSe: Spin (s±) or orbital (s++) fluctuation SUPERCONDUCTIVITY PAIRING MECHANISM from COBALT ⋯ T. URATA et al.'. Together they form a unique fingerprint.

Cite this