2008/04/04 by Sudhakar Pandey, Avinash Singh
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Band gap #Condensed matter physics #Electron #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Magnon #Magnonics #Multiferroics and related materials #Phosphorene #Physics #Quantum mechanics #Quasiparticle #Spin (aerodynamics) #Spin Hall effect #Spin polarization #Spin wave #Superconductivity #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.78.014414
8 pages, 7 figures
arxiv created 2008/04/04 · openalex publication_date 2008/07/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The effects of correlation-induced coupling between spin and charge fluctuations on spin-wave excitations in a band ferromagnet are investigated by including self-energy and vertex corrections within a systematic inverse-degeneracy expansion scheme which explicitly preserves the Goldstone mode. Arising from the scattering of a magnon into intermediate spin-excitation states (including both magnon and Stoner excitations) accompanied with charge fluctuations in the majority-spin band, this spin-charge coupling results not only in a substantial reduction of magnon energies but also in anomalous softening and significant magnon damping for zone-boundary modes lying within the Stoner gap. Our results are in good qualitative agreement with recent spin-wave excitation measurements in colossal magnetoresistive manganites and ferromagnetic ultrathin films of transition metals.