Spin Wave Response in the Dilute Quasi-one Dimensional Ising-like Antiferromagnet CsCo_{0.83}Mg_{0.17}Br_3

TL;DR

This study investigates spin wave excitations in a dilute quasi-one-dimensional Ising-like antiferromagnet using inelastic neutron scattering, confirming theoretical predictions of the spin wave spectrum with experimental data.

Contribution

The paper provides experimental neutron scattering data and theoretical analysis that accurately describe the spin wave spectrum in a dilute Ising-like antiferromagnet, validating perturbation theory predictions.

Findings

Experimental spin wave spectra match theoretical models.

The Q dependence of the spin wave energy follows predicted analytical form.

Effective spin Hamiltonian accurately describes the dilute antiferromagnet.

Abstract

Inelastic neutron scattering profiles of spin waves in the dilute quasi-one-dimensional Ising-like antiferromagnet CsCo_{0.83}Mg_{0.17}Br_3 have been investigated. Calculations of S^{xx}(Q,omega), 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 omega_{xx}(Q)=(2J)(1-5epsilon^{2}cos^{2}Qa+2epsilon^{2})^{1/2}, calculated by Ishimura and Shiba using perturbation theory.