Hot-magnon sideband in the fluorescence spectrum of CsMnCl3·2D2O

We report the observation of hot-magnon sidebands in the fluorescence spectrum of the ${}_{}{}^4{}_{}{}^{}T_{1g}^{}{}_{}{}^{}$ state of deuterated CsMn${\mathrm{Cl}}_3$·${2\mathrm{H}}_2$O. A simplified theoretical model similar to that used in an earlier study of CsMn${\mathrm{Cl}}_3$·${2\mathrm{H}}_2$O accounts well for the hot-magnon line shapes. Evidence is also presented for the existence of multimagnon sidebands in the cold-magnon emission of this compound.