Abstract
The first direct measurement of the modulation of the magnetic superexchange parameter J by optical phonons is reported. High-pressure Raman scattering studies of the model compound FeBO 3 reveal an unexpectedly large interaction between a (BO 3 ) 3- internal mode and spin-pair excitations. By pressure tuning J, resonant decay of the phonon into the two-magnon continuum and associated mixing were observed yielding a phonon-magnon-pair coupling constant g≃(0.15-0,20)J
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