Low Temperature Magnetic Properties of the Double Exchange Model

Abstract

We study the {\it ferromagnetic} (FM) Kondo lattice model in the strong coupling limit (double exchange (DE) model). The DE mechanism proposed by Zener to explain ferromagnetism has unexpected properties when there is more than one itinerant electron. We find that, in general, the many-body ground state of the DE model is {\it not} globally FM ordered (except for special filled-shell cases). Also, the low energy excitations of this model are distinct from spin wave excitations in usual Heisenberg ferromagnets, which will result in unusual dynamic magnetic properties.

5 pages, RevTeX, 5 Postscript figures included

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• Spin Wave Theory of Double Exchange Ferromagnets
• Reentrant spin glass behavior in a layered manganite La1.2Sr1.8Mn2O7 single crystals
• High Temperature Thermodynamics of the Ferromagnetic Kondo-Lattice Model
• Magnetic Order in the Double Exchange Model in Infinite Dimensions
• Three--body Correlation Effects on the Spin Dynamics of Double--Exchange Ferromagnets
• Non--Heisenberg Spin Dynamics of Double-Exchange Ferromagnets with Coulomb Repulsion
• Spin-orbit coupled correlated metal phase in Kondo lattices: an implementation with alkaline-earth atoms
• Spin Diffusion in Double-Exchange Manganites
• Magnetization Relaxation and Collective Spin Excitations in Correlated Double--Exchange Ferromagnets
• Fermionic representation for the ferromagnetic Kondo lattice model -- diagrammatic study of spin-charge coupling effects on magnon excitations
• Order from disorder in the double-exchange model
• Scaling relation of spin wave lifetime in double-exchange systems
• From Frustrated to Unfrustrated: Coupling two triangular-lattice itinerant Quantum Magnets