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- W3104455511 abstract "A new `dynamical mean-field theory' based approach for the Kondo lattice model with quantum spins is introduced. The inspection of exactly solvable limiting cases and several known approximation methods, namely the second-order perturbation theory, the self-consistent CPA and finally a moment-conserving decoupling of the equations of motion, help in evaluating the new approach. This comprehensive investigation gives some certainty to our results. Whereas our method is somewhat limited in the investigation of the J<0 model, the results for J>0 reveal important aspects of the physics of the model: the energetically lowest states are not completely spin-polarized. A band splitting, which occurs already for relatively low interaction strengths, can be related to distinct elementary excitations, namely magnon emission (absorption) and the formation of magnetic polarons. We demonstrate the properties of the ferromagnetic Kondo lattice model in terms of spectral densities and quasiparticle densities of states." @default.
- W3104455511 created "2020-11-23" @default.
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- W3104455511 date "2001-03-01" @default.
- W3104455511 modified "2023-09-26" @default.
- W3104455511 title "Quantum effects in the quasiparticle structure of the ferromagnetic Kondo lattice model" @default.
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- W3104455511 doi "https://doi.org/10.1088/0953-8984/13/11/310" @default.
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