Lattice-spin mechanism in colossal magnetoresistive manganites
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2002
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American Physical Society
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Abstract
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, which coincides with the paramagnetic-ferromagnetic phase transition.
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© 2002 American Physical Society. We are grateful to F. Guinea, J. L. Alonso, and S. Fratini for discussions. Financial support is acknowledged from Grants No. PB96-0085 (MEC, Spain) and CAM-07N/0008/2001 (Madrid, Spain). V. M-M. is partially supported by E.C. Contract No. HPMF-CT2000-00450.