Lattice-Spin Mechanism in Colossal Magnetoresistant Manganites

Details Lattice-Spin Mechanism in Colossal Magnetoresistant Manganites Lattice-Spin Mechanism in Colossal Magnetoresistant Manganites

2001-09-06

arxiv.org/abs/cond-mat/0109127v2

Physics

Condensed Matter

Materials Science

4 pages, 5 figures, ReVTeX macro, accepted for publication in PRL

Scientific paper

We present a single-orbital double-exchange model, coupled with cooperative phonons (the so called breathing-modes of the oxygen octahedra in manganites). The model is studied with Monte Carlo simulations. For a finite range of doping and coupling constants, a first-order Metal-Insulator phase transition is found, that coincides with the Paramagnetic-Ferromagnetic phase transition. The insulating state is due to the self-trapping of every carrier within an oxygen octahedron distortion.

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