Exciton dynamics and energy transfers in pure CsMnF3

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Abstract
We report the spectral and time characteristics of the fluorescence of CsMnF3. The weak intrinsic fluorescence in nominally pure samples is analysed with time resolved techniques showing the energy transfer processes from exciton to fluorescing traps. By applying either a uniaxial stress along the Mn2-Mn1 direction or a high magnetic field in the basal plane we are able to monitor the efficiency of this energy transfer. Moreover a non linear exciton decay channel is observed for exciton densities up to 1018 cm-3. Assuming an exciton-exciton interaction mechanism, the collision parameter PB is used to estimate an effective diffusion coefficient D ∼ 10-8 cm2 S-1. The validity of the exciton model is then discussed, and the results obtained on CsMnF3 are shown to be consistent with the ones known on MnF2. Finally a description of the propagation of the excitation involving the exchange interaction between third nearest neighbour Mn2 ions having parallel spins is proposed, in agreement with the stress and high magnetic field data

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