Spin-fluctuation-driven orbital nematic order in Ru-oxides: Self-consistent vertex correction analysis for two-orbital model

Yusuke Ohno, Masahisa Tsuchiizu, Seiichiro Onari, Hiroshi Kontani

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

To reveal the origin of the "nematic electronic fluid phase" in Sr3Ru2O7, we apply the self-consistent vertex correction analysis to the (dxz, dyz)-orbital Hubbard model. It is found that the Aslamazov-Larkin type vertex correction causes the strong coupling between spin and orbital fluctuations, which corresponds to the Kugel-Khomskii spin-orbital coupling in the local picture. Owing to this mechanism, orbital nematic order with C2 symmetry is induced by the magnetic quantum criticality in multiorbital systems, whereas this mechanism is ignored in the random-phaseapproximation (RPA). This study provides a natural explanation for the close relationship between the magnetic quantum criticality and nematic state in Sr3Ru2O7 and Fe-based superconductors.

Original languageEnglish
Article number013707
Journaljournal of the physical society of japan
Volume82
Issue number1
DOIs
Publication statusPublished - Jan 1 2013

Keywords

  • Orbital nematic order
  • Quantum criticality
  • SrRuO
  • Vertex correction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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