Journal of Experimental and Theoretical Physics

, Volume 127, Issue 4, pp 713–720 | Cite as

Superexchange Interaction in Magnetic Insulators with Spin Crossover

  • V. A. GavrichkovEmail author
  • S. I. Polukeev
  • S. G. Ovchinnikov


We present the derivation of a microscopic superexchange Hamiltonian for undoped magnetic insulators with an arbitrary spin. It is established that the sign of the (ferromagnetic or antiferromagnetic) superexchange between magnetic ions in the dn configuration depends on the spin nature of virtual multielectron states dn± 1, viz., low-spin or high-spin partners with S ± 1/2 relative to ground state of the dn configuration with spin S. A macroscopic substantiation is given for the Goodenough–Kanamori rules and simple mean-field estimates connecting the magnetic ordering temperature with the exchange constant. The conventional Anderson superexchange for magnetic materials with spin S = 1/2 and the P/T magnetic phase diagram for ferroborate FeBO3 with spin crossover S = (5/2 ↔ 1/2) at the Fe3+ ion under a high pressure are also reproduced as a test.



This work was supported by the Russian Science Foundation (project no. 18-12-00022).


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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • V. A. Gavrichkov
    • 1
    Email author
  • S. I. Polukeev
    • 1
  • S. G. Ovchinnikov
    • 1
  1. 1.Kirensky Institute of Physics, Siberian Branch, Russian Academy of SciencesKrasnoyarskRussia

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