JAHN-TELLER EFFECTS IN MÖSSBAUER SPECTROSCOPYReport as inadecuate




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Abstract : We examine the consequences for the Mössbauer spectrum of coupling between asymmetric vibrational modes and an electronic state having orbital degeneracy – the Jahn-Teller JT effect. Characteristic modifications of the quadrupole coupling by a spontaneous JT distortion « static JT effect » and by a dynamic coupling of electronic and vibrational motions « dynamic JT effect » are discussed with the aid of a simplified model. The importance of small crystal strains in determining the type of spectrum observed is discussed, as is also the role of thermally induced transitions in causing motional averaging of the spectrum. Examples are given of JT effects as observed or anticipated in the Mössbauer spectrum of Fe2+ in crystal sites with tetrahedral and octahedral coordination.





Author: F. Ham

Source: https://hal.archives-ouvertes.fr/



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