Dyson–Maleev theory of an X X Z ferrimagnetic spin chain with single-ion anisotropy  

作　　者：Yin-Xiang Li-Jun Tian Bin Chen Yu-Ge Chen 陈宇戈;李殷翔;田立君;陈斌

机构地区：[1]College of Sciences,Shanghai University,Shanghai 200444,China [2]Tin Ka-Ping College of Science,University of Shanghai for Science and Technology,Shanghai 200093,China

出　　处：《Chinese Physics B》2018年第12期466-470,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.10774035);the Qianjiang RenCai Program of Zhejiang Province,China(Grant No.2007R0010)

摘　　要：We use the mean-field approximation of Dyson–Maleev representation to study an XXZ Heisenberg ferrimagnetic spin chain with single-ion anisotropy. By solving the self-consistent equations with different anisotropies, λ and D respectively,the energy spectrums, internal energy, static susceptibility and specific heat are calculated. Especially, the quantum phase transition of the magnetization plateau induced by single-ion anisotropy D is obtained in the model of the ferrimagnetic spin chain by using Dyson–Maleev mean-field theory.We use the mean-field approximation of Dyson–Maleev representation to study an XXZ Heisenberg ferrimagnetic spin chain with single-ion anisotropy. By solving the self-consistent equations with different anisotropies, λ and D respectively,the energy spectrums, internal energy, static susceptibility and specific heat are calculated. Especially, the quantum phase transition of the magnetization plateau induced by single-ion anisotropy D is obtained in the model of the ferrimagnetic spin chain by using Dyson–Maleev mean-field theory.

关 键 词：Dyson–Maleev mean-field theory XXZ anisotropy Single-ion anisotropy ferrimagnetic spin chain 

分 类 号：O4[理学—物理]