Joint effect of lattice interaction and potential fluctuation in colossal magnetoresistive manganites
Abstract
Taking into account both the Jahn-Teller lattice distortion and the on-site electronic potential fluctuations in the orbital-degenerated double-exchange model, in which both the core-spin and the lattice distortion are treated classically, we investigate theoretically the metal-insulator transition (MIT) in manganites by considering the electronic localization effect. An inverse matrix method is developed for calculation in which we use the inverse of the transfer matrix to obtain the localization length. We find that within reasonable range of parameters, both the lattice effect and the potential fluctuation are responsible to the occurrence of the MIT. The role of the orbital configuration is also discussed.
- Publication:
-
Physical Review B
- Pub Date:
- November 2004
- DOI:
- arXiv:
- arXiv:cond-mat/0408189
- Bibcode:
- 2004PhRvB..70r4444G
- Keywords:
-
- 75.47.Gk;
- 71.30.+h;
- 71.38.-k;
- 72.15.Gd;
- Colossal magnetoresistance;
- Metal-insulator transitions and other electronic transitions;
- Polarons and electron-phonon interactions;
- Galvanomagnetic and other magnetotransport effects;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 4 figures