Spin-wave dispersion softening in the ferromagnetic Kondo lattice model for manganites

2000/11/28 by F. Mancini, N. B. Perkins, N.B. Perkins +2 · 4 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Rare-earth and actinide compounds #cond-mat.str-el

paper · pdf · doi:10.1016/s0375-9601(01)00321-8

published as Phys. Lett. A 284, 286 (2001) · 6 RevTex pages, 3 embedded PostScript figures

arxiv created 2000/11/28 · openalex publication_date 2001/06/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Spin dynamics is calculated in the ferromagnetic (FM) state of the generalized Kondo lattice model taking into account strong on-site correlations between e_g electrons and antiferromagnetic (AFM) exchange among t_2g spins. Our study suggests that competing FM double-exchange and AFM super-exchange interaction lead to a rather nontrivial spin-wave spectrum. While spin excitations have a conventional Dq² spectrum in the long-wavelength limit, there is a strong deviation from the spin-wave spectrum of the isotropic Heisenberg model close to the zone boundary. The relevance of our results to the experimental data are discussed.

Cited by

• Three-body correlation effects on the spin dynamics of double-exchange ferromagnets
• Magnons in ferromagnetic metallic manganites
• Spin-wave expansion, finite temperature corrections, and order from disorder effects in the double exchange model
• Study of the spin- Hubbard–Kondo lattice model by means of the Composite Operator Method

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