东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2005, Vol. 26 ›› Issue (7): 711-714.DOI: -

• 论著 • 上一篇    

横场下Ising变磁体的基态性质

刘静;魏国柱;顾永伟;张起   

  1. 东北大学理学院;东北大学理学院;东北大学理学院;东北大学理学院 辽宁沈阳　110004
  • 收稿日期:2013-06-24 修回日期:2013-06-24 出版日期:2005-07-15 发布日期:2013-06-24
  • 通讯作者: Liu, J.
  • 作者简介:-
  • 基金资助:
    教育部高等学校博士学科点专项科研基金资助项目(20030145019)

Ground state properties of Ising metamagnet in transverse field

Liu, Jing (1); Wei, Guo-Zhu (1); Gu, Yong-Wei (1); Zhang, Qi (1)   

  1. (1) School of Sciences, Northeastern University, Shenyang 110004, China
  • Received:2013-06-24 Revised:2013-06-24 Online:2005-07-15 Published:2013-06-24
  • Contact: Liu, J.
  • About author:-
  • Supported by:
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摘要： 采用平均场理论研究了横场下双子晶格Ising变磁体的基态磁性质,计算了基态能量、纵向交错磁矩、纵向磁化率、横向磁矩等重要物理量·分别计算了施加不同横向磁场Ω时纵向交错磁矩ms,z0,纵向磁化率χt,z0和横向总磁矩mt,x0随纵向磁场的变化·结果表明,横向磁场的作用使系统的自旋由与平面垂直方向朝着与平面平行方向偏转,从而阻碍了自旋沿与平面垂直方向的反转·给出了纵向磁场h与横向磁场Ω平面的基态相图,确定了三相点的位置为hi=0 3578,Ω=0 7156·计算表明,在横向磁场较小而纵向磁场较大时,系统发生一级相变;在横向磁场较大而纵向磁场较小时,系统发生二级相变;横向磁场对Ising变磁体的基态...

关键词: 横向磁场, Ising变磁体, 平均场理论, 一级相变, 二级相变

Abstract: The ground state properties of the two-sublattice Ising metamagnet in the transverse field are studied introducing the mean-field theory. A phase diagram is given via the h-Ω rectanguler coordinates where h is the longitudinal field and Ω is the transverse field. The ground state energy, the longitudinal total magnetization, staggered magnetization and susceptibility and the transverse total magnetization are all calculated. The results show that when the transverse field Ω is small but the longitudinal field h great, the first-order transition occurs, and when the former is great but the later small the second-order transition occurs in the system. The effect of the transverse field Ω on the ground state properties of the two-sublattice Ising metamagnet is important.

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