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Phys. Rev. B 65, 134444 (2002) [8 pages]

Charge and spin inhomogeneous phases in the ferromagnetic Kondo lattice model

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D. J. Garcia1, K. Hallberg1, C. D. Batista2, S. Capponi3, D. Poilblanc3, M. Avignon4, and B. Alascio1
1Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atomica, 8400 S. C. de Bariloche, Argentina
2Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
3Laboratoire de Physique Quantique IRSAMC, Universite Paul Sabatier, 118 Route de Narbonne, 31 062 Toulouse, France
4Laboratoire d’Etudes des Proprietes Electroniques des Solides-CNRS, Boîte Postal 166, 38042 Grenoble Cedex 9, France

Received 16 October 2001; published 29 March 2002

We study numerically the one-dimensional ferromagnetic Kondo lattice. This model is widely used to describe nickel and manganese perovskites. Due to the competition between double and superexchange, we find a region where the formation of magnetic polarons induces a charge-ordered state. This ordering is present even in the absence of any intersite Coulomb repulsion. There is an insulating gap associated to the charge structure formation. We also study the insulator-metal transition induced by a magnetic field, which removes simultaneously both charge and spin ordering.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.134444
DOI:
10.1103/PhysRevB.65.134444
PACS:
75.30.Mb
 
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