外壳层最近邻交换相互作用对 Blume-Capel模型相变行为的影响

The effect of the closest neighbor exchange interaction on the phase transition behavior of the Blume-Capel model

利用有效场理论研究了纳米管上双模随机晶场中混合自旋Blume-Capel模型的相变行为.结果表明,系统相变行为与取值概率、晶场强度比值、晶场参数、温度以及外壳层最近邻交换相互作用密切相关.取值概率、晶场强度比值、晶场参数和外壳层最近邻交换相互作用等诸多因素相互竞争,影响系统的一级和二级相变以及临界点.

The phase transition behavior of the mixed spin Blume-Capel model in a two-mode random crystal field on a nanotube is studied by using the effective field theory. The results show that the phase transition behavior of the system is closely related to the probability of value taking, crystal field strength ratio, crystal field parameters, temperature and the nearest neighbor exchange interaction of the shell layer. Many factors such as the probability of selection, crystal field strength ratio, crystal field parameters and the closest neighbor exchange interaction of shell layer compete with each other, affecting the first-order and second-order phase transitions and critical points of the system.