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Cooperative phenomena in spin crossover systems

机译:自旋交叉系统中的合作现象

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摘要

Within the framework of a realistic multiband p-d 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 d~6 ions.
机译:在一个现实的多频带p-d模型的框架内,我们导出了一个有效的哈密顿量,以描述在压力下磁性Mott-Hubbard绝缘子的自旋交叉附近的交换相互作用效应。结果表明,在晶体场变化下自旋交联的单离子机理不会导致热力学相变。但是,在T = 0时出现了量子相变。已经发现,协同作用导致量子相变到一阶相变的改变以及系统的亚稳态的出现。获得了压力-温度相图,以描述具有d〜6离子的Mott绝缘子的自旋交叉附近的磁化和高自旋分布。

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  • 来源
    《Physical review》 |2017年第13期|134103.1-134103.11|共11页
  • 作者单位

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

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

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

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

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