Journal
PHYSICAL REVIEW B
Volume 75, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.75.140401
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With a variational three-body calculation we study the role of the interplay between the on-site Coulomb, Hund's rule, and superexchange interactions on the spin-wave excitation spectrum of itinerant ferromagnets. We show that correlations between a Fermi sea electron-hole pair and a magnon result in a very pronounced zone boundary softening and strong deviations from the Heisenberg spin-wave dispersion. We show that this spin dynamics depends sensitively on the Coulomb and exchange interactions and discuss its possible relevance to recent experiments in the manganites.
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