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Effect of the Inter-Sublattice Exciton Transfer on the Magnon Sideband

General feature of the magnon sideband is investigated taking into account the inter-sublattice exciton transfer and the orbital degeneracy of the exciton state. The results are applied to 4 E g (G) states of RbMnF 3 and MnF 2 . The effect of large transfer integral as a possible mechanism responsible for the appearance of exciton-magnon bound state and multi-magnon sideband is proposed and discussed. Fair agreement with experiments for RbMnF 3 is obtained by assuming this mechanism. The observed change in the absorption spectra due to Co impurity of the system KMn 1- x Co x F 3 is understood by the proposed mechanism.