Long-range orders and spin/orbital freezing in the two-band Hubbard model

Karim Steiner, Shintaro Hoshino, Yusuke Nomura, Philipp Werner

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

We solve the orbitally degenerate two-band Hubbard model within dynamical mean field theory and map out the instabilities to various symmetry-broken phases based on an analysis of the corresponding lattice susceptibilities. Phase diagrams as a function of the Hund coupling parameter J are obtained both for the model with rotationally invariant interaction and for the model with Ising-type anisotropy. For negative J, an intraorbital spin-singlet superconducting phase appears at low temperatures, while the normal state properties are characterized by an orbital-freezing phenomenon. This is the negative-J analog of the recently discovered fluctuating-moment induced s-wave spin-triplet superconductivity in the spin-freezing regime of multiorbital models with J>0.

Original languageEnglish
Article number075107
JournalPhysical Review B
Volume94
Issue number7
DOIs
Publication statusPublished - 2016 Aug 3
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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