贝特格子上纵场作用下的混合自旋模型性质研究  

Mixed Spin Ising Ferromagnetic System in a Longitudinal Magnetic Field on Bethe Lattice

作　　者：张鑫[1] 

机构地区：[1]滨州学院,山东滨州256603

出　　处：《廊坊师范学院学报（自然科学版）》2009年第5期44-46,共3页Journal of Langfang Normal University(Natural Science Edition)

基　　金：滨州学院科研基金项目:混合自旋系统相变和临界现象的研究(BZXYQNLG200620)

摘　　要：利用迭代方法,在铁磁情况下,研究了外场作用下二重Cayley树上自旋为1/2和3/2的混合Ising系统的热力学性质。通过数值求解,得出了亚晶格磁化强度MA,MB和总磁化强度M随温度变化的曲线。研究发现,亚晶格磁化强度MA、MB以及总的磁化强度在相同的外场条件下的变化趋势是一致的,只是饱和磁化强度数值有所不同,通过外场取值的不同,发现存在外场时与外场取零时磁化强度随温度变化趋势有所区别。结果还发现,铁磁情况下不管是否存在外场该系统都不存在三临界行为。Using the recursion method, the thermodynamic behavior of the mixed spin -1/2 and spin -3/2 Ising system on Bethe lattice in a longitudinal field are studied for the ferromagnetic case. Through the numerical solution, the relations of sublattice magnetizations MA, MB and the total magnetization M with the temperature are obtained, respectively. It is found that the behavior of M is similar to that of MA, MB. Only Saturation magnetization values are different. Through the different field values, the behavior of the magnetizations are different with the temperature. There is no tricritical be- havior for the ferromagnetic system.

关 键 词：磁化强度 混合Ising自旋系统 贝特格子 迭代方法 

分 类 号：O55[理学—热学与物质分子运动论]