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Raman scattering in FeBO 3 at high pressures: Phonon coupled to spin-pair fluctuations and magneto-deformation potentials

1992; American Physical Society; Volume: 69; Issue: 15 Linguagem: Inglês

10.1103/physrevlett.69.2299

1092-0145

M. J. Massey, R. Merlín, S. M. Girvin,

Crystal Structures and Properties

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 ${\mathrm{FeBO}}_{3}$ reveal an unexpectedly large interaction between a (${\mathrm{BO}}_{3}$${)}^{3\mathrm{\ensuremath{-}}}$ 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\ensuremath{\approxeq}(0.15--0.20)J.