Quantum behavior of orbitals in ferromagnetic titanates: Novel orderings and excitations

被引：79

作者：

Khaliullin, G

Okamoto, S

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.89.167201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the collective behavior of orbital angular momentum in the spin ferromagnetic state of a Mott insulator with t(2g) orbital degeneracy. The frustrated nature of the interactions leads to an infinite degeneracy of classical states. Quantum effects select four distinct orbital orderings. Two of them have a quadrupolar order, while the other states show in addition weak orbital magnetism. Specific predictions are made for neutron scattering experiments which might help to identify the orbital order in YTiO3 and to detect the elementary orbital excitations.

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页码：167201/1 / 167201/4

页数：4

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