Magnon softening and damping in the ferromagnetic manganites due to orbital correlations

Details Magnon softening and damping in the ferromagnetic manganites due to orbital correlations Magnon softening and damping in the ferromagnetic manganites due to orbital correlations

2001-12-13

arxiv.org/abs/cond-mat/0112252v2

J. Magn. Magn. Mat. 272-276, 458-459 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 2 figures, SCES2003 Roma, to appear in J. Mag. Magn. Mat

Scientific paper

10.1016/j.jmmm.2003.11.160

We present a theory for spin excitations in ferromagnetic metallic manganites and demonstrate that orbital fluctuations have strong effects on the magnon dynamics in the case these compounds are close to a transition to an orbital ordered state. In particular we show that the scattering of the spin excitations by low-lying orbital modes with cubic symmetry causes both the magnon softening and damping observed experimentally.

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