Hole doping and weak quenched disorder effects on the 1D Kondo lattice for ferromagnetic Kondo couplings

Details Hole doping and weak quenched disorder effects on the 1D Kondo lattice for ferromagnetic Kondo couplings Hole doping and weak quenched disorder effects on the 1D Kondo lattice for ferromagnetic Kondo couplings

1997-06-06

arxiv.org/abs/cond-mat/9706068v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTex, Submitted to PRB

Scientific paper

We investigate the one-dimensional Kondo lattice model (1D KLM) for ferromagnetic Kondo couplings, by using the bosonization method. The ferromagnet ic 2-leg spin ladder and the S=1 antiferromagnet occur as new one-dimensional Kondo insulators, for a half-filled band. First,a very small hole-doping makes the charge sector massless and it can produce, either an incommensurate RKKY interaction or a S=1 ferromagnet according to the strength of the ferromagnetic Kondo coupling. Second, we investigate, the effects of a weak and quenched disorder on these two Kondo insulators, by applying renormalization group methods: the Anderson localization is suppressed only in the context of a strong ferromagnetic Kondo coupling.

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