Spin Wave Theory of Double Exchange Ferromagnets

Abstract

We construct the 1/S spin-wave expansion for double exchange ferromagnets at T=0. It is assumed that the value of Hund's rule coupling, J_H, is sufficiently large, resulting in a fully saturated, ferromagnetic half-metallic ground state. We evaluate corrections to the magnon dispersion law, and we also find that, in contrast to earlier statements in the literature, magnon-electron scattering does give rise to spin wave damping. We analyse the momentum dependence of these quantities and discuss the experimental implications for colossal magnetoresistance compounds.

4 pages, Latex-Revtex, 2 PostScript figures. Minor revisions, references added. See also cond-mat/9909213

References in corpus (7)

• Evolution of the low-frequency spin dynamics in ferromagnetic manganites
• Magnon Damping by magnon-phonon coupling in Manganese Perovskites
• Neutron Scattering Studies on Magnetic Structure of the Double-Layered Manganite La_{2-2x}Sr_{1+2x}Mn_2O_7 ($0.30\le x\le 0.50$)
• Structure and Spin Dynamics of La${}_{0.85}$Sr${}_{0.15}$MnO${}_3$
• Fermi surface of the colossal magnetoresistance perovskite La_{0.7}Sr_{0.3}MnO_{3}
• Spin Dynamical Properties of the Layered Perovskite La1.2Sr1.8Mn2O7
• Scaling relation of spin wave lifetime in double-exchange systems

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• First-order nature of the ferromagnetic phase transition in (La-Ca)MnO_3 near optimal doping
• Spectacular doping dependence of interlayer exchange and other results on spin waves in bilayer manganites
• A novel spin wave expansion, finite temperature corrections and order from disorder effects in the double exchange model
• Magnons in Ferromagnetic Metallic Manganites
• Spin dynamics in (III,Mn)V ferromagnetic semiconductors: the role of correlations
• Spin wave resonances in La_{0.7}Sr_{0.3}MnO_{3} films: measurement of spin wave stiffness and anisotropy field
• Effects of the On-Site Coulomb Repulsion in Double Exchange Magnets
• Three--body Correlation Effects on the Spin Dynamics of Double--Exchange Ferromagnets
• Electron Spin Flip Relaxation by One Magnon Processes: Application to the Gadolinium surface band
• Non--Heisenberg Spin Dynamics of Double-Exchange Ferromagnets with Coulomb Repulsion
• Anomaly in Spin Excitation Spectrum of Double-Exchange Systems with Randomness
• Magnetic Domain Walls in Single-Phase and Phase-Separated Double Exchange Systems
• Composite Spin Waves, Quasi-Particles and Low Temperature resistivity in Double Exchange Systems
• Microscopic model, spin wave theory and competing orders in the double perovskites
• Spin Diffusion in Double-Exchange Manganites
• Spectral Function Analysis on Spin Dynamics in Double-Exchange Systems with Randomness
• Magnetization Relaxation and Collective Spin Excitations in Correlated Double--Exchange Ferromagnets
• Colossal magnetoresistance and quenched disorder in manganese oxides
• Noise studies of magnetization dynamics in dilute magnetic semiconductor heterostructures
• Dynamics of Phase Separated States in the Double Exchange Model
• Spin wave damping arising from phase coexistence below $T_c$ in colossal magnetoresistive La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$
• Fermionic representation for the ferromagnetic Kondo lattice model -- diagrammatic study of spin-charge coupling effects on magnon excitations
• Spin Dynamics of Double-Exchange Manganites with Magnetic Frustration
• Order from disorder in the double-exchange model
• Ferromagnetic Excitations in La${}_{0.82}$Sr${}_{0.18}$CoO${}_3$ Observed Using Neutron Inelastic Scattering
• Theory of spin wave excitations of metallic A-type antiferromagnetic manganites
• Interacting spin waves in the ferromagnetic Kondo lattice model
• Double Exchange in a Magnetically Frustrated System
• Magnon self energy in the correlated ferromagnetic Kondo lattice model: spin-charge coupling effects on magnon excitations in manganites
• Phenomenological model of anomalous magnon softening and damping in half-metallic manganites
• Canted Ferromagnetism in Double Exchange Model with on-site Coulomb Repulsion
• Perturbative calculation of the spin-wave dispersion in a disordered double-exchange model