Magnetic field effects in a correlated electron system with spin-state degree of freedom - Implication of an excitonic insulator -

Abstract

Magnetic field (H) effects on a correlated electron system with the 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 H to the low-spin (LS) phase induces the excitonic insulating phase, as well as the spin-state ordered phase where the LS and high-spin (HS) states are ordered alternately. In the case where H is applied to the HS phase, a reentrant transition for the HS phase appears. A rich variety of the phase diagrams are attributed to the spin-state degree of freedom and their combinations in the wave function as well as in the real-space configuration.

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• Theoretical investigation of excitonic magnetism in LaSrCoO${}_4$
• Spin texture and spin current in excitonic phases of the two-band Hubbard model
• A review on magnetic field induced spin crossover in LaCoO${}_3$ up to 600 T
• 100 MHz high-speed strain monitor using fiber Bragg grating and optical filter applied for magnetostriction measurements of cobaltite at magnetic fields beyond 100 T
• Optical Response in Excitonic Insulating State: Variational Cluster Approach
• Excitonic Correlations, Spin-State Ordering, and Magnetic-Field Effects in One-Dimensional Two-Orbital Hubbard Model for Spin-Crossover Region
• Magnetism of competing high-spin/low-spin states in Ba${}_2$NiO${}_2$(AgSe)${}_2$ and related two-orbital two-electron systems
• Excitonic ordering in strongly correlated spin crossover systems: induced magnetism and excitonic excitation spectrum
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• Magnetostriction studies up to megagauss fields using fiber Bragg grating technique
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• Magneto-Electric Effect in a Spin-State Transition System