Orbit-lattice coupling parameters in and < 111> dilute silver-rare earth monocrystals from magnetostriction measurements

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Abstract
Following a report of magnetostriction measurements on < 001 > silver-rare earth monocrystals, we now present measurements on < 111 > samples of the same dilute alloys. After correcting for a volume term estimated from the < 001 > data, we analyse the < 111 > shape effect in terms of second and fourth order ion-lattice interaction contributions, using crystal-field parameters recently suggested by Kikkert and Niesen. We are able to deduce the orbit-lattice coupling parameters V52 and V54. For each rare earth V52 has the opposite sign to V32 which is the corresponding parameter for the < 001 > geometry. This result is in contradiction to the prediction of a point-charge model and allows us to suggest that, in addition to the contribution of localized charges, there is an important contribution of conduction electrons to the interaction between the rare earth ion and the surrounding lattice

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