Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-03-05
PHYSICAL REVIEW B 75, 140401(R) (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, published in Physical Review B as rapid communications
Scientific paper
10.1103/PhysRevB.75.140401
With a variational three--body calculation we study the role of the interplay between the onsite Coulomb, Hund's rule, and superexchange interactions on the spinwave 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 spinwave dispersion. We show that this spin dynamics depends sensitively on the Coulomb and exchange interactions and discuss its possible relevance to experiments in the manganites.
Kapetanakis M. D.
Perakis I. E.
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