Localized spin ordering in Kondo lattice models

Details Localized spin ordering in Kondo lattice models Localized spin ordering in Kondo lattice models

2001-11-20

arxiv.org/abs/cond-mat/0111355v1

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex, 4 pages, 4 eps figures embedded

Scientific paper

10.1103/PhysRevB.65.052410

Using a non-Abelian density matrix renormalization group method we determine the phase diagram of the Kondo lattice model in one dimension, by directly measuring the magnetization of the ground-state. This allowed us to discover a second ferromagnetic phase missed in previous approaches. The phase transitions are found to be continuous. The spin-spin correlation function is studied in detail, and we determine in which regions the large and small Fermi surfaces dominate. The importance of double-exchange ordering and its competition with Kondo singlet formation is emphasized in understanding the complexity of the model.

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