Prediction of orbital ordering in single-layered ruthenates

被引：77

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 | 2002年 / 88卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.88.017201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The key role of the orbital degree of freedom to understanding the magnetic properties of layered ruthenates is discussed based on the 3-orbital Hubbard model coupled to lattice distortions, using numerical and mean-field techniques. In the G-type antiferromagnetic phase of Ca2RuO4, recent x-ray experiments reported 0.5 holes/site in the d(xy) orbital, while d(yz) and d(zx) orbitals contain 1.5 holes. This unexpected t(2g) hole distribution is explained by a novel orbital ordered (OO) state, stabilized by a combination of Coulombic and lattice effects. The phase diagram suggests the possibility of large magneto-resistance effects and a new ferromagnetic OO phase in ruthenates.

引用

页码：4 / 172014

页数：4

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