最近邻原子间交换相互作用对纳米管上Blume-Capel模型磁热性质的影响

利用有效场理论研究了纳米管上最近邻原子间交换相互作用对Blume-Capel模型格点的磁化强度、内能、比热和自由能的影响,得到了系统格点的磁化强度、内能、比热和自由能与交换相互作用和晶场强度的关系.结果表明:最近邻交换相互作用和晶场强度等诸多因素相互竞争,使系统表现出丰富的磁学特性;正晶场对系统磁化强度具有促进作用;负晶场对系统磁化强度具有抑制作用;负晶场作用下,系统发生一级相变;晶场强度参数和交换相互作用不同时,系统的内能、比热和自由能也呈现出奇异性.

Some characteristic behavior of the Blume-Capel model on nanotube with the exchange interaction between the nearest neighbor atoms

The effects of the exchange interaction between the nearest neighbor atoms on the magnetic strength, internal energy, specific heat and free energy of the lattice points in the Blume-Capel model were studied by using the effective field theory. The results show that the nearest neighbor exchange interaction and the strength of crystal field compete with each other, which makes the system show rich magnetic characteristics. The positive crystal field can promote the magnetization of the system. The negative crystal field can inhibit the magnetization of the system. Under the action of negative crystal field, the system has a first order phase transition. In addition, the internal energy, specific heat and free energy of the system are also different.