In-gap excitation effect on a superexchange in La2CuO4 by creating nonequilibrium photoexcited centers

Abstract

We propose a multielectron approach to calculate superexchange interaction in magnetic Mott- Hubbard insulator La2CuO4(further La214) that allows to obtain the effect of optical pumping on the superexchange interaction. We use the cell perturbation theory with exact diagonalization of the multiband pd Hamiltonian inside each CuO6 unit cell and treating the intercell hopping as perturbation. To incorporate effect of optical pumping we include in this work the excited singlehole local states as well as all two-hole singlets and triplets. By projecting out the interband intercell electron hopping we have obtained the effective Heisenberg-like Hamiltonian with the local spin at site Ri being a superposition of the ground and excited single-hole states. We found that antiferromagnetic contribution to the exchange energy in La214 will increase in accordance to ~ 4*10_{-3} eV /(%) at the resonance light occupation of the excited single hole in-gap state.

arXiv comment7 pages, 3 figures

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Cited by in corpus (8)

• Manipulating magnetism by ultrafast control of the exchange interaction
• Cooperative Phenomena in Spin Crossover Systems
• Optical control of competing exchange interactions and coherent spin-charge coupling in two-orbital Mott insulators
• Cation spin and superexchange interaction in oxide materials below and above spin crossover under high pressure
• Effect of CuO2 lattice strain on the electronic structure and properties of high-Tc cuprate family
• The higher-order magnetic skyrmions in non-uniform magnetic fields
• Magnetism in spin crossover systems: short-range order and effects beyond the Heisenberg model
• Excitonic ordering in strongly correlated spin crossover systems: induced magnetism and excitonic excitation spectrum