Local correlation effects on the s±- and s±-wave superconductivities mediated by magnetic and orbital fluctuations in the five-orbital hubbard model for iron pnictides

Jun Ishizuka, Takemi Yamada, Yuki Yanagi, Yoshiaki Ono

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We investigate the electronic state and the superconductivity in the five-orbital Hubbard model for iron pnictides by using the dynamical mean-field theory in conjunction with the Eliashberg equation. The renormalization factor exhibits significant orbital dependence resulting in the large change in the band dispersion as observed in recent ARPES experiments. The critical interactions towards the magnetic, orbital and superconducting instabilities are suppressed as compared with those from the random phase approximation (RPA) due to local correlation effects. Remarkably, the s-pairing phase due to the orbital fluctuation is largely expanded relative to the RPA result, while the s±-pairing phase due to the magnetic fluctuation is reduced.

Original languageEnglish
Article number123712
Journaljournal of the physical society of japan
Volume82
Issue number12
DOIs
Publication statusPublished - 2013 Dec 1
Externally publishedYes

Keywords

  • Dynamical mean-field theory
  • Five-orbital Hubbard model
  • Iron-based superconductor
  • Orbital fluctuation
  • Spin fluctuation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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