Ferromagnetic, A-type, and charge-ordered CE-type states in doped manganites using Jahn-Teller phonons

被引：159
|
作者：
Yunoki, S [1 ]
Hotta, T
Dagotto, E
机构：
[1] Florida State Univ, Natl Lab High Energy Phys, Tallahassee, FL 32306 USA
[2] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA
来源：
PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 16期
关键词：
D O I：
10.1103/PhysRevLett.84.3714
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The two-orbital model for manganites with both noncooperative and cooperative Jahn-Teller phonons is studied at hole density x = 0.5 using Monte Carlo techniques. The phase diagram is obtained by varying the electron-phonon coupling and the t(2g)-spins exchange. The insulating CE-type charge- and orbital-ordered state with the z-axis charge stacking observed in narrow-bandwidth manganites is stabilized in the simulations. Its charge gap Delta(CO) is much larger than the critical temperature k(B)T(CO). Metalliclike A-type and ferromagnetic states are also obtained in the same framework, and the phase boundaries among them have first-order characteristics.
引用
收藏
页码：3714 / 3717
页数：4
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