Non--Heisenberg Spin Dynamics of Double-Exchange Ferromagnets with Coulomb Repulsion

Details Non--Heisenberg Spin Dynamics of Double-Exchange Ferromagnets with Coulomb Repulsion Non--Heisenberg Spin Dynamics of Double-Exchange Ferromagnets with Coulomb Repulsion

2007-03-05

arxiv.org/abs/cond-mat/0703099v2

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.

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