最近邻强交换相互作用对spin-1纳米管热力学性质的影响

利用有效场理论研究了纳米管上最近邻强交换相互作用下Blume-Capel模型的内能、比热和自由能,得到了系统的内能、比热和自由能与最近邻强交换相互作用、晶场强度和温度的关系.结果表明:最近邻强交换相互作用、晶场强度和温度等诸多因素相互竞争,使系统表现出比J_1=J_2=J=1时的BC模型更为丰富的热力学性质;系统内能随温度的变化曲线表现出不连续性;比热随温度的变化出现奇异性;一定条件下,基态时的自由能会发生突变.

Effects of strong exchange interactions on the thermodynamic properties of spin-1 nanotube

The effective field theory is used to study the internal energy, specific heat and free energy of the Blume-Capel model in the nearest-neighbor strong exchange interaction on nanotubes, and the relationship between the internal energy, specific heat and free energy of the system and the strong exchange interaction and crystal field in the nearest-neighbor is obtained. The results show that the thermodynamic properties of the system are more abundant than those of the BC model at = = =1 due to the strong exchange interaction of the nearest neighbor and the strength of the crystal field. The curve of energy change with temperature shows discontinuity. The specific heat curve presents singularities. Under certain conditions, the free energy in the ground state will mutate.