Dimensionality Driven Spin-Flop Transition in Layered Iridates

被引：120

作者：

Kim, J. W. ^{[2
]}

Choi, Y. ^{[2
]}

Kim, Jungho ^{[2
]}

Mitchell, J. F. ^{[1
]}

Jackeli, G. ^{[3
]}

Daghofer, M. ^{[4
]}

van den Brink, J. ^{[4
]}

Khaliullin, G. ^{[3
]}

Kim, B. J. ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[3] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[4] IFW Dresden, Inst Theoret Solid Sate Phys, D-01069 Dresden, Germany

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 03期

关键词：

CRYSTAL-STRUCTURE; SR3IR2O7;

D O I：

10.1103/PhysRevLett.109.037204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using resonant x-ray diffraction, we observe an easy c-axis collinear antiferromagnetic structure for the bilayer Sr3Ir2O7, a significant contrast to the single layer Sr2IrO4 with in-plane canted moments. Based on a microscopic model Hamiltonian, we show that the observed spin-flop transition as a function of number of IrO2 layers is due to strong competition among intra-and interlayer bond-directional pseudodipolar interactions of the spin-orbit entangled J(eff) = 1/2 moments. With this we unravel the origin of anisotropic exchange interactions in a Mott insulator in the strong spin-orbit coupling regime, which holds the key to the various types of unconventional magnetism proposed in 5d transition metal oxides.

引用

页数：5

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