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 email@example.com
Revised: 30 March 2011
Published online: 22 June 2011
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, Sxx(q, ω) using the basis of domain wall pair states. It is shown that the line shapes of Sxx(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.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011