Abstract
The 4T1g→6A1g emission of single crystals of antiferromagnetic KMnF3 and RbMnF3 has been studied. In RbMnF3 we identified 3 pure electronic lines, while there is only one in KMnF3. The lifetime of these excitons is found to be shorter than impurity induced emission. The sidebands arising from the coupling of 1-, 2-, and 3-magnons were separated in KMnF3 by time-resolved spectroscopy. The peak energy of 71 cm-1 is different from that in absorption (65 cm-1) because of the different exciton-magnon interaction. In RbMnF3 the multimagnon process couples to a strong transition 27 cm-1 lower than the intrinsic exciton. The results of uniaxial stress experiments in emission agree with previous results found by other workers in absorption.
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