Spin-state transition and phase separation in a multiorbital Hubbard model

Ryo Suzuki, Tsutomu Watanabe, Sumio Ishihara

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

We study the spin-state transition and the phase separation involved in this transition based on the multiorbital Hubbard model. Multiple spin states are realized by changing the energy separation between two orbitals and the on-site Hund coupling. By utilizing the variational Monte-Carlo simulation, we analyze the electronic and magnetic structures in hole doped and undoped states. Electronic phase separation occurs between the low-spin band insulating state and the high-spin ferromagnetic metallic state. The difference in the band widths of the two orbitals is of prime importance for the spin-state transition and the phase separation.

Original languageEnglish
Article number054410
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number5
DOIs
Publication statusPublished - 2009 Aug 18

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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