Spin waves in the 3d Heisenberg antiferromagnetic systems K2Fe1−xInxCl5·D2O (x=0.0 and 0.05)

Abstract The magnetic excitation spectra of the low anisotropy Heisenberg antiferromagnetic S= 5 2 systems K 2 Fe 1− x In x Cl 5 ·D 2 O ( x =0.0 and 0.05) are studied by means of inelastic neutron scattering experiments. A set of four exchange constants and the anisotropy energy have been determined from the analysis of the dispersion curves using a four-sublattice model. No indication of magnon– fracton crossover is observed from our results.