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

Krivenko, S.; Yaresko, A.; Khaliullin, G.; Fehske, H.

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

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Yaresko, A.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society;

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Khaliullin, G.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Krivenko, S., Yaresko, A., Khaliullin, G., & Fehske, H. (2004). Magnon softening and damping in the ferromagnetic manganites due to orbital correlations. Journal of Magnetism and Magnetic Materials, 272-276, 458-459.

Cite as: https://hdl.handle.net/21.11116/0000-000E-FBA6-C

Abstract

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. (C) 2003 Elsevier B.V. All rights reserved.