Magnetic order and dynamics in an orbitally degenerate ferromagnetic insulator

被引：96

作者：

Ulrich, C ^{[1
]}

Khaliullin, G

Okamoto, S

Reehuis, M

Ivanov, A

He, H

Taguchi, Y

Tokura, Y

Keimer, B

机构：

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

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

[3] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany

[4] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[5] Univ Tokyo, Dept Appl Phys, Tokyo 113, Japan

来源：

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

关键词：

D O I：

10.1103/PhysRevLett.89.167202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutron scattering was used to determine the spin structure and the magnon spectrum of the Mott-Hubbard insulator YTiO3. The magnetic structure is complex, comprising substantial G-type and A-type antiferromagnetic components in addition to the predominant ferromagnetic component. The magnon spectrum, on the other hand, is gapless and nearly isotropic. We show that these findings are inconsistent with the orbitally ordered states thus far proposed for YTiO3 and discuss general implications for a theoretical description of exchange interactions in orbitally degenerate systems.

引用

页码：167202/1 / 167202/4

页数：4

共 28 条

[1] Direct observation of orbital ordering in YTiO3 by means of the polarized neutron diffraction technique [J].

Akimitsu, J ;

Ichikawa, H ;

Eguchi, N ;

Miyano, T ;

Nishi, M ;

Kakurai, K .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2001, 70 (12) :3475-3478

[2] REPRESENTATION ANALYSIS OF MAGNETIC STRUCTURES [J].

BERTAUT, EF .

ACTA CRYSTALLOGRAPHICA SECTION A-CRYSTAL PHYSICS DIFFRACTION THEORETICAL AND GENERAL CRYSTALLOGRAPHY, 1968, A 24 :217-&

[3] Two-dimensional planar ferromagnetic coupling in LaMnO3 [J].

Hirota, K ;

Kaneko, N ;

Nishizawa, A ;

Endoh, Y .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (12) :3736-3739

[4] Magnetic ordering, orbital ordering, and resonant x-ray scattering in perovskite titanates [J].

Ishihara, S ;

Hatakeyama, T ;

Maekawa, S .

PHYSICAL REVIEW B, 2002, 65 (06) :644421-644429

[5] Orbital ordering and local magnetic properties of Mott-Hubbard insulators YTiO3 and LaTiO3:NMR study [J].

Itoh, M ;

Tsuchiya, M ;

Tanaka, H ;

Motoya, K .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1999, 68 (08) :2783-2789

[6] Spin dynamics and orbital state in LaTiO3 [J].

Keimer, B ;

Casa, D ;

Ivanov, A ;

Lynn, JW ;

von Zimmermann, M ;

Hill, JP ;

Gibbs, D ;

Taguchi, Y ;

Tokura, Y .

PHYSICAL REVIEW LETTERS, 2000, 85 (18) :3946-3949

[7] Orbital liquid in three-dimensional Mott insulator:: LaTiO3 [J].

Khaliullin, G ;

Maekawa, S .

PHYSICAL REVIEW LETTERS, 2000, 85 (18) :3950-3953

[8] Quantum behavior of orbitals in ferromagnetic titanates: Novel orderings and excitations [J].

Khaliullin, G ;

Okamoto, S .

PHYSICAL REVIEW LETTERS, 2002, 89 (16) :167201/1-167201/4

[9] Order from disorder:: Quantum spin gap in magnon spectra of LaTiO3 -: art. no. 212405 [J].

Khaliullin, G .

PHYSICAL REVIEW B, 2001, 64 (21)

[10]

KULDA J, COMMUNICATION

← 1 2 3 →