铁磁晶体在Ising模型下作Bethe近似时的热力学性质分析

Thermodynamic nature analysis on ferromagetic crystal Ising model low - down Bethe approximate

通过全面分析铁磁晶体系统在各种情况下的自由能、内能和热容量发现:铁磁晶体系统的自由能、内能和热容量不仅与系统是否受到外加的磁场和系统内自旋集团及自旋本身之间的积分交换耦合系数有关,也与系统温度是否大于系统特征温度有关,同时还发现:在B=0时,如不考虑系统存在的自发磁化现象,系统的内能和热容量与一般的二能级系统在外磁场作用下的内能和热容量有相同的形式但不稳定。

Through the overall analysis on ferromaagetic crystal system for free energy, internal energy and thermal capacity, it is disscovered that the free energy, internal energy and thermal capacity of fer-romagetic crystal system have relations not only whether it is with system to get the integral exchange couple coefficinent between spin group as well as spin in extra magnetic field and system relevant, also whether it is with systematic temperature to be larger than systematic feature temperature relevant. It is also discovered that when B = 0, if not considering the spontaneous magnetize phenomenon, the internal energy and thermal capacity effect have identical form but instability, under the outside effect of magnetic field on systematic internal energy and thermal capacity and general 2 energy level.