Magnon Damping by magnon-phonon coupling in Manganese Perovskites

Details Magnon Damping by magnon-phonon coupling in Manganese Perovskites Magnon Damping by magnon-phonon coupling in Manganese Perovskites

1999-04-26

arxiv.org/abs/cond-mat/9904372v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 4 figures

Scientific paper

10.1103/PhysRevB.61.9553

Inelastic neutron scattering was used to systematically investigate the spin-wave excitations (magnons) in ferromagnetic manganese perovskites. In spite of the large differences in the Curie temperatures ($T_C$s) of different manganites, their low-temperature spin waves were found to have very similar dispersions with the zone boundary magnon softening. From the wavevector dependence of the magnon lifetime effects and its correlation with the dispersions of the optical phonon modes, we argue that a strong magneto-elastic coupling is responsible for the observed low temperature anomalous spin dynamical behavior of the manganites.

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