arXiv:cond-mat/0111355 · Physical review. B, Condensed matter

Localized spin ordering in Kondo lattice models

Ian P. McCulloch, Aušrius Juozapavičius, Anders Rosengren, M. Gulácsi

Published Jan 10, 2002• 60 citations

Abstract

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.

DOI: 10.1103/physrevb.65.052410

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