Existence of staggered fields in the Ising-like antiferromagnetic compounds CsCoCl<sub>3sub> and CsCoBr<sub>3sub>
- 作者：Asim Kumar Ghosh<sup> ; sup><sup>asimkumar96@yahoo.comsup>
- 关键词：Magnetism ; Staggered field ; Dynamical structure factor ; Ising-like antiferromagnet ; CsCoCl3 ; CsCoBr3
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2012
- 期刊代码：31_03048853
- 类别：ph
- 出版时间：September, 2012
- 卷：324
- 期：18
- 页码：2907-2913
- 文件大小：556 K
摘要
The line shapes of dynamical spin correlation functions of the Ising-like antiferromagnetic compounds, CsCoCl<sub>3sub> and CsCoBr<sub>3sub>, show asymmetry about its peak positions in which the spectral weights mainly concentrate in the low energy side. We consider a one-dimensional Ising-like Heisenberg antiferromagnetic Hamiltonian and study the dynamics of domain wall excitations in the presence of a staggered magnetic field h<sub>xsub> along the transverse direction in order to explain those asymmetric line shapes. We obtain dynamical spin correlation functions along the magnetic field and perpendicular to it . It is shown that the line shapes of and are highly asymmetric at all values of q and h<sub>xsub>. An excellent agreement with the experimental data throughout the whole Brillouin zone is observed upon considering a finite value of the staggered fields for both the compounds CsCoCl<sub>3sub> and CsCoBr<sub>3sub>. The existence of staggered fields is justified by considering the zigzag orientations of the nonmagnetic atoms about the magnetic Co atoms.