Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-10-15
Phys. Rev. B 77, 134447 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, 9 figures
Scientific paper
10.1103/PhysRevB.77.134447
A purely fermionic representation is introduced for the ferromagnetic Kondo lattice model which allows conventional diagrammatic tools to be employed to study correlation effects. Quantum 1/S corrections to magnon excitations are investigated using a systematic inverse-degeneracy expansion scheme which incorporates correlation effects in the form of self-energy and vertex corrections, while explicitly preserving the continuous spin-rotation symmetry. Magnon self-energy is studied in the full range of interaction strength, and shown to result in strong magnon damping and anomalous softening for zone boundary modes, which accounts for several zone-boundary anomalies observed in recent spin-wave measurements of ferromagnetic manganites.
Das Subrat
Ghosh Saptarshi
Kamble Bhaskar
Pandey Sudhakar
Ray Rajyavardhan
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