Eur. Phys. J. B 82, 19-27 (2011)
https://doi.org/10.1140/epjb/e2011-10554-y

Domain wall dynamics of the spin- Ising-like antiferromagnetic chain in presence of Dzyaloshinskii-Moriya interactions

Department of Physics, Jadavpur University, 188 Raja S. C. Mallik Road, 700 032 Kolkata, India

Corresponding author: ^a asimkumar96@yahoo.com

Received: 17 July 2010
Revised: 30 March 2011
Published online: 22 June 2011

Abstract

We consider a one-dimensional Ising-like S = Heisenberg antiferromagnetic Hamiltonian and study the dynamics of domain wall excitations in presence of both uniform and staggered Dzyaloshinskii-Moriya interactions. We obtain dispersion relations and dynamical spin correlation functions, S^xx(q, ω) using the basis of domain wall pair states. It is shown that the line shapes of S^xx(q, ω) are highly asymmetric over the whole Brillouin zone such that the spectral weights mainly concentrate in the low energy side. It is observed that presence of staggered Dzyaloshinskii-Moriya interaction explains the experimental results on the Ising-like antiferromagnetic compounds CsCoCl₃ and CsCoBr₃ very well.