Abstract
We have analysed the Mossbauer quadrupole data of high-spin Fe 2+ located in the tetragonally distorted octahedra of K 2 ZnF 4 and Ba 2 ZnF 6 . The dynamical linear Jahn-Teller coupling between the orbital excited states E g , in D 4h symmetry, involves the vibrational modes A 1g , B 1g , B 2g of the cluster FeF 6 ; spin-orbit coupling is introduced, and a full mathematical treatment is performed in a basis of dimension 5 (orbit)×5 (spin)×10 (vibrations). This leads to a spectacular improvement of the calculated thermal variations of the quadrupole splitting in both systems, when compared to the results of the static crystal field model Analyse des donnees quadripolaires Mossbauer de Fe 2+ a haut spin dans les octaedres a distorsion quadratique de K 2 ZnF 4 et Ba 2 ZnF 6 , en introduisant le couplage Jahn-Teller dynamique lineaire entre les etats orbitaux excites E g , en symetrie D 4h , par les modes de vibration A 1g , B 1g , B 2g de l'agregat FeF 6 . Traitement mathematique rigoureux dans une base de dimension 5 (orbite)×5 (spin)×10 (vibrations), en tenant compte du couplage spin-orbite. Forte amelioration des courbes de variation thermique de la decomposition quadripolaire par rapport aux resultats anterieurs en champ cristallin statique
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