Electronic properties of the Fe2+ ion in CaF2 from Mössbauer and far infrared spectroscopy

1 January 1979

journal article
Published by EDP Sciences in Journal de Physique

Vol. 40 (10) , 997-1003
https://doi.org/10.1051/jphys:019790040010099700

Abstract

The system CaF2 : Fe2+ has been studied by Mössbauer spectroscopy in the slow relaxation regime (4.2-14 K). Far infrared experiments have been performed in the 1.5-35 K temperature range and at 1.5 K in an external magnetic field up to 8 T. From both Mössbauer and far infrared results, one can deduce that the average distance between the spin-orbit levels within the Eg state is K = 17 cm-1. This value lies in the typical range 10-20 cm-1 predicted by Ham. From this measure of K, we propose for the distance Δ between the Eg and T2g orbital states the calculated value Δ = 5 320 cm-1. We conclude that crystal field theory alone can account for the electronic properties of the 5Eg ground state and consequently dynamical Jahn-Teller effects can be neglected

Keywords

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