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A strong interaction has been observed between the magnon and phonon excitations in ferrous difluoride which is believed to originate from the phonon modulation of the crystal field, much as in Van Vleck's model for paramagnetic relaxation. A detailed investigation is possible because previous studies of various magnetic properties of FeF 2 give sound values for the crystal field parameters. The spin Hamiltonian is shown to contain a coupling linear in both the nuclear displacements and spin, and it gives a good description of the low temperature neutron scattering measurements for all wave-vectors in the (001) and (100) directions.
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S W Lovesey (1972) studied this question.
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