Coherence and metamagnetism in the two-dimensional Kondo lattice model
We report the results of dynamical mean-field calculations for the metallic Kondo lattice model subject to an applied magnetic field. High-quality spectral functions reveal that the picture of rigid, hybridized bands, which are Zeeman shifted in proportion to the field strength, is qualitatively correct. We find evidence of a zero-temperature magnetization plateau whose onset coincides with the chemical potential entering the spin up hybridization gap. The plateau appears at the field scale predicted by a (static) large-N mean-field theory and has a magnetization value consistent with that of x = 1 – nc spin-polarized heavy holes, where nc < 1 is the conduction band filling of the noninteracting system. We argue that the emergence of the plateau at a low temperature marks the onset of quasiparticle coherence.
@article{
title = {Coherence and metamagnetism in the two-dimensional Kondo lattice model},
author = {Beach, K. S. D. and Assaad, F. F.},
journal = {Physical Review B},
volume = {77},
issue = {20},
pages = {205123},
numpages = {7},
year = {2008},
month = {May},
doi = {10.1103/PhysRevB.77.205123},
url = {http://link.aps.org/doi/10.1103/PhysRevB.77.205123},
publisher = {American Physical Society}
}