Spin-wave response in the dilute quasi-one-dimensional Ising-like antiferromagnet CsCo0.83Mg0.17Br3

Inelastic neutron-scattering profiles of spin waves in the dilute quasi-one-dimensional Ising-like antiferromagnet CsCo0.83Mg0.17Br3 have been investigated. Calculations of Sxx(Q,ω), based on an effective spin Hamiltonian, accurately describe the experimental spin-wave spectrum of the 2J mode. The Q dependence of the energy of this spin-wave mode follows the analytical prediction ωxx(Q)=(2J)(1–5ε2 cos2 Qa+2ε2)1/2, calculated by Ishimura and Shiba using perturbation theory.