Abstract

An analysis of the internal strain degrees of freedom in zircon-structure crystals RMO4 is given. These are related to local distortions in the neighbourhood of the R3+ ions, and hence to the orbit-lattice coupling coefficients. The corresponding spin-lattice coupling coefficients are obtained for distortions involved in Jahn-Teller phase transitions and comparisons with experimental values are made for TmVO4 and DyVO4.

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