TYABLIKOV APPROXIMATION IN THE THEORY OF LOW-DIMENSIONAL QUANTUM HEISENBERG FERROMAGNETS AND ANTIFERROMAGNETS

被引：65
|
作者：
YABLONSKIY, DA
机构：
[1] Institute for Low Temperature Physics and Engineering, Ukrainian SSR Academy of Sciences, Kharkov
来源：
PHYSICAL REVIEW B | 1991年 / 44卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.44.4467
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The method of double-time-temperature spin Green functions is used to develop the theory of low-dimensional quantum Heisenberg ferromagnets and antiferromagnets with arbitrary spin. In the Tyablikov approximation, the correlation functions, the susceptibility of ferromagnets, and the staggered susceptibility of antiferromagnets as well as the magnetic-field dependence of the magnetization for ferromagnets are found. The formulas derived describe ferromagnets and antiferromagnets at arbitrary temperatures and interpolate the regions of low-temperature and high-temperature behavior. It is paramagnetic temperature that separates the regions of different analytical behavior of the system parameters.
引用
收藏
页码：4467 / 4472
页数：6
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