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Phys. Rev. Lett. 69, 2299 - 2302 (1992)

Raman scattering in FeBO3 at high pressures: Phonon coupled to spin-pair fluctuations and magneto-deformation potentials

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M. J. Massey and R. Merlin
The Harrison M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109-1120

S. M. Girvin
Department of Physics, Indiana University, Bloomington, Indiana 47405

Received 20 July 1992

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 FeBO3 reveal an unexpectedly large interaction between a (BO3)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.


©1992 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.69.2299
DOI: 10.1103/PhysRevLett.69.2299
PACS: 75.50.Ee, 75.30.Et, 75.80.+q, 78.30.Hv

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