Magnetic field effects in a correlated electron system with Spin-State degree of freedom - Implications for an excitonic insulator

Taro Tatsuno, Eriko Mizoguchi, Joji Nasu, Makoto Naka, Sumio Ishihara

研究成果: Article査読

27 被引用数 (Scopus)

抄録

Magnetic field (H) effects on a correlated electron system with a spin-state degree of freedom are examined. The effective Hamiltonian derived from the two-orbital Hubbard model is analyzed by the mean-field approximation. Applying a magnetic field to the low-spin (LS) phase induces an excitonic insulating phase as well as a spin-state ordered phase where the LS and high-spin (HS) states are ordered alternately. When H is applied to the HS phase, a reentrant transition for the HS phase appears. A rich variety of the phase diagrams is attributed to the spin-state degree of freedom and their combinations in the wave function as well as in the real-space configuration. The present results provide a possible interpretation for the recent experimental observation of LaCoO3 under a strong magnetic field.

本文言語English
論文番号083706
ジャーナルjournal of the physical society of japan
85
8
DOI
出版ステータスPublished - 2016 8月 15
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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