Effect of Transverse Correlation Function on the Thermodynamic Quantities of Ferromagnetic Systems  

作　　者：秦伟 王怀玉 龙桂鲁 

机构地区：[1]Department of Physics, Tsinghua University

出　　处：《Communications in Theoretical Physics》2013年第4期494-502,共9页理论物理通讯（英文版）

基　　金：Supported by the National 973 Project 2012 CB927402;the National Natural Science Foundation under Grant Nos.11074145 and 61275028

摘　　要：The effect of transverse correlation between spins on the thermodynamic properties of ferromagnetic systems is investigated in details. Qualitatively, at finite temperature the transverse correlation reflects the short-range interaction between spins, so that lowers the internal energy and consequently raises the free energy. It also means the introduction o[ some ordering, and hence lowers the entropy. It is depressed by the field which forces the spins to turn to the field direction, so that it decreases with the field when temperature is fixed. The low-temperature expansion of the energy shows that the inclusion of the transverse correlation at least partly considers the interaction between spin waves.

关 键 词：ferromagnetic system Green＇s function transverse correlation thermodynamic properties 

分 类 号：O414.1[理学—理论物理] TM271.014[理学—物理]