Cooperative phenomena in spin crossover systems

Alexander I. Nesterov, Yuri S. Orlov, Sergey G. Ovchinnikov, and Sergey V. Nikolaev
Phys. Rev. B 96, 134103 – Published 9 October 2017

Abstract

Within the framework of a realistic multiband pd model, we derived an effective Hamiltonian to describe the exchange interaction effects near the spin crossover in magnetic Mott-Hubbard insulators under pressure. It is shown that the single-ion mechanism of spin crossover under the change in the crystal field does not lead to a thermodynamic phase transition; however, at T=0 a quantum phase transition appears. It has been found that the cooperativity leads to a modification of the quantum phase transition to a first-order phase transition and the appearance of metastable states of the system. The pressure-temperature phase diagram has been obtained to describe the magnetization and high-spin population near the spin crossover of Mott's insulators with d6 ions.

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  • Received 20 February 2017
  • Revised 12 August 2017

DOI:https://doi.org/10.1103/PhysRevB.96.134103

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Alexander I. Nesterov*

  • CUCEI, Universidad de Guadalajara, Guadalajara, Codigo Postal 44420, Jalisco, Mexico

Yuri S. Orlov and Sergey G. Ovchinnikov

  • Kirensky Institute of Physics, Federal Research Center, KSC SB RAS, 660036 Krasnoyarsk, Russia and Siberian Federal University, 660041 Krasnoyarsk, Russia

Sergey V. Nikolaev§

  • Institute of Engineering and Radio Electronics, Siberian Federal University, 660041 Krasnoyarsk, Russia

  • *nesterov@cencar.udg.mx
  • jso.krasn@mail.ru
  • sgo@iph.krasn.ru
  • §25sergeyn@mail.ru

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Issue

Vol. 96, Iss. 13 — 1 October 2017

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