2007/03/31 by Myron D. Kapetanakis, M. D. Kapetanakis, I. E. Perakis · 4 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.75.140401
published as PHYSICAL REVIEW B 75, 140401(R) (2007) · 4 pages, 4 figures, published in Physical Review B as rapid communications
openalex publication_date 2007/04/03 · arxiv created 2007/04/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.