Orbital Dynamics: The Origin of Anomalous Magnon Softening in Ferromagnetic Manganites

Details Orbital Dynamics: The Origin of Anomalous Magnon Softening in Ferromagnetic Manganites Orbital Dynamics: The Origin of Anomalous Magnon Softening in Ferromagnetic Manganites

1999-04-22

arxiv.org/abs/cond-mat/9904316v2

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We study the renormalization of magnons by charge and coupled orbital-lattice fluctuations in colossal magnetoresistance compounds. The model considered is an orbitally degenerate double-exchange system coupled to Jahn-Teller active phonons. The modulation of ferromagnetic bonds by low-energy orbital fluctuations is identified as the main origin of the unusual softening of the zone-boundary magnons observed experimentally in manganites.

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