Orbital ordering, new phases, and stripe formation in doped layered nickelates

被引：41

作者：

Hotta, T ^{[1
]}

Dagotto, E

机构：

[1] Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 22期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.92.227201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Ground-state properties of layered nickelates are investigated based on the orbital-degenerate Hubbard model coupled with lattice distortions, by using numerical techniques. The Neel state composed of spin S=1 ions is confirmed in the undoped limit x=0. At x=1/2, novel antiferromagnetic states, called CE- and E-type phases, are found by increasing the Hund's coupling. (3x(2)-r(2)/3y(2)-r(2))-type orbital ordering is predicted to occur in a checkerboard-type charge-ordered state. At x=1/3, both Coulombic and phononic interactions are found to be important, since the former stabilizes the spin stripe, while the latter leads to the striped charge order.

引用

页码：227201 / 1

页数：4

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