Spin-state transition and phase separation in multi-orbital Hubbard model

Details Spin-state transition and phase separation in multi-orbital Hubbard model Spin-state transition and phase separation in multi-orbital Hubbard model

2009-05-09

arxiv.org/abs/0905.1389v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

We study spin-state transition and phase separation involving this transition based on the milti-orbital Hubbard model. Multiple spin states are realized by changing the energy separation between the 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 one. Difference of the band widths in the two orbitals is of prime importance for the spin-state transition and the phase separation.

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