Magnetic Polarons in the 1D FM Kondo Model

Abstract

The ferromagnetic Kondo model with classical corespins is studied via unbiased Monte-Carlo simulations. We show that with realistic parameters for the manganites and at low temperatures, the double-exchange mechanism does not lead to phase separation in one-dimensional chains but rather stabilizes individual ferromagnetic polarons. Within the ferromagnetic polaron picture, the pseudogap in the one-particle spectral function A_k(ω) can easily be explained. Ferromagnetic polarons also clear up a seeming failure of the double-exchange mechanism in explaining the comparable bandwidths in the ferromagnetic and paramagnetic phase. For our analysis, we extend a simplified model, the finite temperature uniform hopping approach (UHA), to include polarons. It can easily be evaluated numerically and provides a simple quantitative understanding of the physical features of the ferromagnetic Kondo model.

11 pages, 9 figures included, additional refs added

References in corpus (4)

• Temperature-dependent quasiparticle band structure of the ferromagnetic semiconductor EuS
• Charge and spin inhomogeneous phases in the Ferromagnetic Kondo Lattice Model
• Uniform hopping approach to the FM Kondo Model at finite temperature
• Effective spinless fermions in the strong coupling Kondo model

Cited by in corpus (9)

• The one dimensional Kondo lattice model at partial band filling
• Orbital polarons versus itinerant e_g electrons in doped manganites
• Dynamical mean field theory for transition temperature and optics of CMR manganites
• Ferromagnetic polarons in the one-dimensional ferromagnetic Kondo model with quantum mechanical S=3/2 core spins
• Spin and lattice effects in the Kondo lattice model
• Polaronic Aspects of the two-dimensional Ferromagnetic Kondo Model
• Magnetic polaron structures in the one-dimensional double and super-exchange model
• Magnon damping and mode softening in quantum double-exchange ferromagnets
• Aspects of the FM Kondo Model: From Unbiased MC Simulations to Back-of-an-Envelope Explanations