Ising-like model for the two-step spin-crossover
Ising-like model for the two-step spin-crossover
复制标题
两步自旋交叉的类 Ising 模型
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
F. Varret
中科院分区：
文献类型：
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作者：
A. Bousseksou;J. Nasser;J. Linares;K. Boukheddaden;F. Varret
我们分析了一个伊辛类模型，在平均场的方法，涉及两个“反铁磁”耦合的子晶格。该模型模拟了所谓的“两步”自旋交叉跃迁，并给出了精确的定义。如果两个亚晶格是等价的，这意味着对称性的自发破缺可能发生在由两个“尼尔温度”限制的温度范围内。它还预测了在温度的“特征”值下，子晶格的磁化（如果它们是不等价的）同时反转。这些功能进行了分析，同时与一些细节。该模型能很好地解释[ Fe（2-pic）_3] Cl_2- EtOH和Fe Ⅱ [5 NO_2-sal-N（1，4，7，10）]的实验数据。
We have analyzed an Ising-like model, in the mean-field approach, involving two “antiferromagnetically” coupled sublattices. This model simulates the so-called “two-step” spin-crossover transition, for which a precise definition is given. If both sublattices are equivalent, it implies a spontaneous breaking of symmetry which may occur within a temperature range limited by two “Neel temperatures”. It, also predicts a simultaneous reversal of the magnetization of the sublattices (if they are unequivalent) at a “characteristic” value of temperature. These features are analyzed simultaneously with some details. The present model fits and explains well the available experimental data concerning [ Fe(2-pic)3] Cl2- EtOH and FeII[ 5NO2 – sal – N(1, 4, 7, 10)] .