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The random-field Ising model with asymmetric bimodal probability distribution

机译:具有非对称双峰概率分布的随机场Ising模型

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The Ising model, in the presence of a random field, is investigated within the mean-field approximation based on Landau expansion. The random field is drawn from the bimodal probability distribution P(h)=pδ(h-h0)+(1-p) δ(h+h0), where the probability p assumes any value within the interval [0,1], asymmetric distribution. The prevailing transitions are of second-order but, for some values of p and h0, first-order phase transitions take place for smaller temperatures and higher h0, thus confirming the existence of a tricritical point. Also, the possible reentrant phenomena in the phase diagram (T-h0 plane) occur for appropriate values of p and h0. Using the variational principle, we determine the equilibrium equation for magnetization and solve it for both transitions and at the tricritical point in order to determine the magnetization profile with respect to h0.
机译:在基于Landau展开的平均场近似内,研究存在随机场的Ising模型。从双峰概率分布P(h)=pδ(h-h0)+(1-p)δ(h + h0)中得出随机字段,其中概率p取区间[0,1]内的任何值,不对称分布。主要的过渡是二阶的,但是对于p和h0的某些值,在较小的温度和较高的h0时会发生一阶的相变,因此确认了三临界点的存在。同样,对于p和h0的适当值,在相图中(T-h0平面)可能会出现折返现象。使用变分原理,我们确定了磁化的平衡方程,并针对两个跃迁和三临界点求解了该方程,以便确定相对于h0的磁化曲线。

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