Magnetism in spin crossover systems: Short-range order and effects beyond the Heisenberg model : научное издание

Описание

Тип публикации: статья из журнала

Год издания: 2019

Идентификатор DOI: 10.1103/PhysRevB.100.144429

Аннотация: To study non-Heisenberg effects in the vicinity of spin crossover in strongly correlated electron systems we derive an effective low-energy Hamiltonian for the two-band Kanamori model. It contains a Heisenberg high-spin term proportional to exchange const To study non-Heisenberg effects in the vicinity of spin crossover in stronglyПоказать полностьюcorrelated electron systems we derive an effective low-energy Hamiltonian for the two-band Kanamori model. It contains a Heisenberg high-spin term proportional to exchange constant as well as a low-spin term proportional to spin gap parameter ϵ. Using cluster mean field theory we obtain several non-Heisenberg effects. Near the critical value of spin gap ϵ there is a magnetic phase transition of first order. In the vicinity of ϵ in the paramagnetic phase we observe nontrivial behavior of the Curie constant in the paramagnetic susceptibility in the wide range of temperature. Reentrant temperature behavior of nearest-neighbor spin-spin correlations is observed at ϵ>. Finally, the pressure-temperature magnetic phase diagram for ferroperriclase is obtained using the effective Hamiltonian. © 2019 American Physical Society.

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Издание

Журнал: PHYSICAL REVIEW B

Выпуск журнала: Vol. 100, Is. 14

Номера страниц: 144429

ISSN журнала: 24699950

Место издания: COLLEGE PK

Издатель: AMER PHYSICAL SOC

Авторы

  • Kuz'min V.I (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia)
  • Orlov Yu S. (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
  • Zarubin A.E. (Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
  • Ovchinnikova T.M. (Fed Res Ctr KSC SB RAS, Sukhachov Inst Forest, Krasnoyarsk 660036, RussiaArticle)
  • Ovchinnikov S.G. (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)

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