Self-consistent vertex correction analysis for iron-based superconductors: Mechanism of coulomb interaction-driven orbital fluctuations

Seiichiro Onari, Hiroshi Kontani

Research output: Contribution to journalArticle

126 Citations (Scopus)

Abstract

We study the mechanism of orbital or spin fluctuations due to multiorbital Coulomb interaction in iron-based superconductors, going beyond the random-phase approximation. For this purpose, we develop a self-consistent vertex correction (VC) method, and find that multiple orbital fluctuations in addition to spin fluctuations are mutually emphasized by the "multimode interference effect" described by the VC. Then, both antiferro-orbital and ferro-orbital (=nematic) fluctuations simultaneously develop for J/U∼0.1, both of which contribute to the s-wave superconductivity. Especially, the ferro-orbital fluctuations give the orthorhombic structure transition as well as the softening of shear modulus C 66.

Original languageEnglish
Article number137001
JournalPhysical Review Letters
Volume109
Issue number13
DOIs
Publication statusPublished - Sep 25 2012
Externally publishedYes

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apexes
iron
orbitals
interactions
softening
superconductivity
shear
interference
approximation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Self-consistent vertex correction analysis for iron-based superconductors : Mechanism of coulomb interaction-driven orbital fluctuations. / Onari, Seiichiro; Kontani, Hiroshi.

In: Physical Review Letters, Vol. 109, No. 13, 137001, 25.09.2012.

Research output: Contribution to journalArticle

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