Existence of staggered fields in the Ising-like antiferromagnetic compounds CsCoCl₃ and CsCoBr₃

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• 作者：Asim Kumar Ghosh ; ^{asimkumar96@yahoo.com}
• 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, CsCoCl₃ and CsCoBr₃, 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_x 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_x. 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 CsCoCl₃ and CsCoBr₃. The existence of staggered fields is justified by considering the zigzag orientations of the nonmagnetic atoms about the magnetic Co atoms.