Interacting spin waves in the ferromagnetic Kondo lattice model

Abstract

We present an new approach for the ferromagnetic, three-dimensional, 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 approximatively solved by applying the Dyson-Maleev transformation and using the "spectral density approach" with a broadened magnon spectral density.

9 pages, 9 figures. Minor changes

References in corpus (8)

• Evolution of spin-wave excitations in ferromagnetic metallic manganites
• Magnons in Ferromagnetic Metallic Manganites
• Spin waves throughout the Brillouin zone and magnetic exchange coupling in ferromagnetic metallic manganites La${}_{1-x}$Ca${}_x$MnO${}_3$ ($x=0.25,0.30$)
• Self-energy approach to the correlated Kondo-lattice model
• Electronic properties of EuB6 in the ferromagnetic regime: Half-metal versus semiconductor
• Non--Heisenberg Spin Dynamics of Double-Exchange Ferromagnets with Coulomb Repulsion
• Fermionic representation for the ferromagnetic Kondo lattice model -- diagrammatic study of spin-charge coupling effects on magnon excitations
• Spin-polarized tunneling currents through a ferromagnetic insulator between two metallic or superconducting leads

Cited by in corpus (3)

• Two-dimensional ferromagnetism with long-range interactions in the layered magnetic topological insulator MnBi2Te4
• Magnon damping and mode softening in quantum double-exchange ferromagnets
• On the Possibility of Ferromagnetism and Half-Metallicity in Local Moment Systems