Non-Heisenberg spin dynamics of double-exchange ferromagnets with Coulomb repulsion

Academic Article

Abstract

  • 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. © 2007 The American Physical Society.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Kapetanakis MD; Perakis IE
  • Volume

  • 75
  • Issue

  • 14