FINITE TEMPERATURE EXCHANGE CORRELATION : APPLICATION TO NMR LINEWIDTHS IN MAGNETIC INSULATORSReportar como inadecuado




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Abstract : The temperature dependent exchange narrowed paramagnetic linewidths ƊHT of the F19 NMR in MnF2, KMnF3, and RbMnF3 are calculated. To first order in TN-T,the auto- and pair correlation functions which determine ƊHT are obtained through short time expansions, calculation of the diffusion coefficient characterizing long time behavior, and short interpolations between these limiting regions. The resulting predictions for the term in ƊH linear in TN-T agree with experiment to within 20 % in the worst case. This is a substantial improvement over the predictions of other commonly used theories.





Autor: D. Hone B. Silbernagel

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



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