Abstract

Within the multielectron model of magnetic insulator with two different spin terms at each cation and spin crossover under high pressure we have studied dynamics of a sudden excited non equilibrium spin state. We obtain the different relaxation of the magnetization, high spin/low spin occupation numbers, and the metal-oxygen bond length for different values of the external pressure. For each pressure-temperature values stationary state agrees to the mean field phase diagrams. We found the long living oscillations of magnetization for the high spin ground state at small pressure. Close to crossover pressure the smooth relaxation is accompanied with a set of sharp strongly non linear oscillations of magnetization and HS/LS occupation numbers that are accompanied by the Franck–Condon resonances.

中文翻译：

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高压下自旋交叉的光诱导超快动力学

摘要

在磁绝缘子的多电子模型中，每个阳离子具有两个不同的自旋项，并且在高压下自旋交叉，我们研究了突然激发的非平衡自旋态的动力学。对于不同的外部压力值，我们获得了不同的磁化弛豫，高自旋/低自旋占据数以及金属-氧键长度。对于每个压力-温度值，稳态与平均场相图一致。我们发现，在低压力下，高自旋基态的磁化寿命长。接近交越压力时，平滑弛豫伴随着一组强烈的强烈的非线性磁化振荡和HS / LS占据数，并伴随有Franck-Condon共振。