Abstract
The two-orbital model for manganites with both noncooperative and cooperative Jahn-Teller phonons is studied at hole density using Monte Carlo techniques. The phase diagram is obtained by varying the electron-phonon coupling and the -spins exchange. The insulating -type charge- and orbital-ordered state with the -axis charge stacking observed in narrow-bandwidth manganites is stabilized in the simulations. Its charge gap is much larger than the critical temperature . Metalliclike -type and ferromagnetic states are also obtained in the same framework, and the phase boundaries among them have first-order characteristics.
- Received 17 September 1999
DOI:https://doi.org/10.1103/PhysRevLett.84.3714
©2000 American Physical Society