Ferromagnetic polarons in the one-dimensional double and super-exchange model
Por:
Vallejo E., López-Urías F., Navarro O., Avignon M.
Publicada:
1 jul 2008
Resumen:
We present an analytical and numerical study of the competition between double and super-exchange (SE) interactions with classical localized spins interacting with itinerant electrons in a one-dimensional (1D) model. A phase separation between ferromagnetic (F) and anti-ferromagnetic (AF) phases was found at low SE interaction energy. The F-AF phase separation consists of a large F polaron within an AF background. For large SE interaction energy, the conduction electrons are self-trapped within separate small magnetic polarons. These magnetic polarons contain a single electron inside two or three sites forming a Wigner crystal. A new phase separation is found between these small polarons and the AF phase. (C) 2008 Elsevier B.V. All rights reserved.
Filiaciones:
Vallejo E.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
López-Urías F.:
Advanced Materials Department, IPICYT, Camino a la Presa San Jose 2055, Lomas 4a. seccion, 78216 San Luis Potosí, S.L.P., Mexico
Navarro O.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Avignon M.:
Institut Néel-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier, BP 166, 38042 Grenoble Cedex 9, France
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