Orbital ordering and two ferromagnetic phases in low-doped La1-xSrxMnO3

被引:10
|
作者
Shen, SQ [1 ]
Gu, RY
Wang, QH
Wang, ZD
Xie, XC
机构
[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
[3] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
[4] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[5] Oklahoma State Univ, Dept Phys, Stillwater, OK 74078 USA
关键词
D O I
10.1103/PhysRevB.62.5829
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present a theory for the transition between two ferromagnetic phases observed experimentally in lightly doped La1-xSrxMnO3. Starting from an electronic model, the instabilities to various types of orbital orderings are studied within the random-phase approximation. In most cases, the instabilities occur in the region of strong correlations. A phase diagram is calculated in the case of strong correlation by means of the projected perturbation technique and the Schwinger boson technique. A phase transition between two types of orbital ordering occurs at a low doping, which may be closely relevant to recent experimental observations.
引用
收藏
页码:5829 / 5833
页数:5
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