2009/10/31 by A. Schwabe, Andrej Schwabe, W. Nolting +1
Materials Science · Physics and Astronomy · #Condensed matter physics #Density of states #Ferromagnetism #Heisenberg model #Lattice (music) #Lattice model (finance) #Magnetic and transport properties of perovskites and related materials #Magnon #Physics #Physics of Superconductivity and Magnetism #Quantum electrodynamics #Quantum mechanics #Rare-earth and actinide compounds #Spin wave #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.80.214408
published as Phys. Rev. B 80, 214408 (2009) · 9 pages, 9 figures. Minor changes
openalex publication_date 2009/12/09 · arxiv created 2009/12/14 · arxiv updated 2010/01/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present an approach for the ferromagnetic, three-dimensional, and translational-symmetric Kondo lattice model, which allows us to derive both magnon energies and linewidths (lifetimes) and to study the properties of the ferromagnetic phase at finite temperatures. Both ``anomalous softening'' and ``anomalous damping'' are obtained and discussed. Our method consists of mapping the Kondo lattice model onto an effective Heisenberg model by means of the ``modified RKKY interaction'' and the ``interpolating self-energy approach.'' The Heisenberg model is approximately solved by applying the Dyson-Maleev transformation and using the ``spectral density approach'' with a broadened magnon spectral density.