Magnon-assisted luminescence in antiferromagnetic manganese carbonate

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Abstract
Strong luminescence observed at a low temperature in the antiferromagnetic MnCO3 disappears near the phase transition temperature. It is interpreted as the emission composed of multimagnon and multi‐magnon‐phonon sidebands associated with a pure electronic transition between 6A1g and 4T1g states of manganese ions. Polarization experiments of the fine structure in this red emission reveal that two kinds of radiative traps participate in the transitions. The integrated intensity of the luminescence is measured as a function of temperature and discussed in terms of a three‐level model in which the energy transfer from an intrinsic exciton to impurity‐induced levels plays an important role.

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