Influence of next-nearest neighbor interaction on low temperature properties of the spin-1/2 one-dimensional ferromagnetic XY model

被引:2
|
作者
Yin, Songqiu [1 ]
Chen, Yuan [1 ]
机构
[1] Guangzhou Univ, Sch Phys & Elect Engn, Dept Phys, Guangzhou 510006, Guangdong, Peoples R China
来源
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2015年 / 29卷 / 31期
关键词
XY model; spin-wave theory; next-nearest neighbor interaction; QUANTUM-THEORY; WAVE THEORY; SYSTEMS; CHAIN; PLANE;
D O I
10.1142/S0217979215502252
中图分类号
O59 [应用物理学];
学科分类号
摘要
In this paper, we apply spin-wave theory to the one-dimensional spin-1/2 ferromagnetic XY model with the next-nearest neighbor interaction. The thermodynamic divergences which the conventional spin-wave theory encounters with, are solved by implementing Takahashi's idea through introducing a Lagrange multiplier in the Hamiltonian to keep zero magnetization. It is shown that the next-nearest neighbor interaction has an influence on the ground-state and low temperature properties of the system. The exponential laws which are induced by the next-nearest neighbor interaction, are found for heights of maxima of the specific heat and its coefficient, as well as the maximum and minimum of the susceptibility coefficient. The maximum positions of the specific heat and its coefficient fit well to the linear and exponential laws under the next-nearest neighbor interaction, respectively.
引用
收藏
页数:15
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