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Effect of Crystal Field on the Electronic Structure of the Two-Band Hubbard Model with Spin Crossover

  • ELECTRONIC PROPERTIES OF SOLID
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Abstract

We consider the change in the electronic structure of the two-band Hubbard model in the regime of strong electron correlations with spin crossover upon the passage through the crossover point depending on the crystal field growth. An abrupt semimetal–insulator–semimetal transition is detected during the passage through the spin crossover point in the absence of the spin–orbit interaction, which is accompanied by a jumpwise redistribution of the partial spectral weight between the poles of the Green function of Fermi quasiparticles. The role of the spin–orbit interaction and the change in the surface topology of surface of one-particle Green function zeros are considered.

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ACKNOWLEDGMENTS

The authors are grateful to S.G. Ovchinnikov for the discussion of the results of this study and valuable remarks.

Funding

This work was supported by the “BASIS” Foundation for Developing Theoretical Physics and Mathematics, the Russian Foundation for Basic Research (project no. 19-03-00017), the Krasnoyarsk Krai Administration, the Krasnoyarsk Krai Science Foundation under research project no. 18-42-243004 “New thermoelectric materials based on multiscale spatially heterogeneous substituted rare-earth cobalt oxides and Ruddlesden–Popper phases.”

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Authors and Affiliations

  1. Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

    Yu. S. Orlov, S. V. Nikolaev & V. A. Dudnikov

  2. Siberian Federal University, 660041, Krasnoyarsk, Russia

    Yu. S. Orlov & S. V. Nikolaev

Authors
  1. Yu. S. Orlov
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  2. S. V. Nikolaev
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  3. V. A. Dudnikov
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Corresponding author

Correspondence to Yu. S. Orlov.

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Translated by N. Wadhwa

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Orlov, Y.S., Nikolaev, S.V. & Dudnikov, V.A. Effect of Crystal Field on the Electronic Structure of the Two-Band Hubbard Model with Spin Crossover. J. Exp. Theor. Phys. 130, 699–710 (2020). https://doi.org/10.1134/S106377612004007X

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  • DOI: https://doi.org/10.1134/S106377612004007X

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