Structural Distortion-Induced Magnetoelastic Locking in Sr2IrO4 Revealed through Nonlinear Optical Harmonic Generation

被引：79

作者：

Torchinsky, D. H. ^{[1
,2
]}

Chu, H. ^{[1
,3
]}

Zhao, L. ^{[1
,2
]}

Perkins, N. B. ^{[4
]}

Sizyuk, Y. ^{[4
]}

Qi, T. ^{[5
]}

Cao, G. ^{[5
]}

Hsieh, D. ^{[1
,2
]}

机构：

[1] CALTECH, Inst Quantum Informat & Matter, Pasadena, CA 91125 USA

[2] CALTECH, Dept Phys, Pasadena, CA 91125 USA

[3] CALTECH, Dept Appl Phys, Pasadena, CA 91125 USA

[4] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55116 USA

[5] Univ Kentucky, Dept Phys & Astron, Ctr Adv Mat, Lexington, KY 40506 USA

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 09期

基金：

美国国家科学基金会;

关键词：

SYMMETRY; SURFACES;

D O I：

10.1103/PhysRevLett.114.096404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a global structural distortion in Sr2IrO4 using spatially resolved optical second and third harmonic generation rotational anisotropy measurements. A symmetry lowering from an I4(1)/acd to I4(1)/a space group is observed both above and below the Neel temperature that arises from a staggered tetragonal distortion of the oxygen octahedra. By studying an effective superexchange Hamiltonian that accounts for this lowered symmetry, we find that perfect locking between the octahedral rotation and magnetic moment canting angles can persist even in the presence of large noncubic local distortions. Our results explain the origin of the forbidden Bragg peaks recently observed in neutron diffraction experiments and reconcile the observations of strong tetragonal distortion and perfect magnetoelastic locking in Sr2IrO4.

引用

页数：5

共 41 条

[1]

[Anonymous], 2003, Principles of Nonlinear Optics

[2]

Birss R. R., 1966, Symmetry and Magnetism

[3] Locking of iridium magnetic moments to the correlated rotation of oxygen octahedra in Sr2IrO4 revealed by x-ray resonant scattering [J].

Boseggia, S. ;

Walker, H. C. ;

Vale, J. ;

Springell, R. ;

Feng, Z. ;

Perry, R. S. ;

Sala, M. Moretti ;

Ronnow, H. M. ;

Collins, S. P. ;

McMorrow, D. F. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2013, 25 (42)

[4] Robustness of Basal-Plane Antiferromagnetic Order and the Jeff=1/2 State in Single-Layer Iridate Spin-Orbit Mott Insulators [J].

Boseggia, S. ;

Springell, R. ;

Walker, H. C. ;

Ronnow, H. M. ;

Rueegg, Ch. ;

Okabe, H. ;

Isobe, M. ;

Perry, R. S. ;

Collins, S. P. ;

McMorrow, D. F. .

PHYSICAL REVIEW LETTERS, 2013, 110 (11)

[5] Antiferromagnetic order and domains in Sr3Ir2O7 probed by x-ray resonant scattering [J].

Boseggia, S. ;

Springell, R. ;

Walker, H. C. ;

Boothroyd, A. T. ;

Prabhakaran, D. ;

Wermeille, D. ;

Bouchenoire, L. ;

Collins, S. P. ;

McMorrow, D. F. .

PHYSICAL REVIEW B, 2012, 85 (18)

[6] The magnetic motif and the wavefunction of Kramers ions in strontium iridate (Sr2IrO4) [J].

Chapon, L. C. ;

Lovesey, S. W. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2011, 23 (25)

[7] Giant magnetoelectric effect in the Jeff=1/2 Mott insulator Sr2IrO4 [J].

Chikara, S. ;

Korneta, O. ;

Crummett, W. P. ;

DeLong, L. E. ;

Schlottmann, P. ;

Cao, G. .

PHYSICAL REVIEW B, 2009, 80 (14)

[8] Dilute magnetism and spin-orbital percolation effects in Sr2Ir1-xRhxO4 [J].

Clancy, J. P. ;

Lupascu, A. ;

Gretarsson, H. ;

Islam, Z. ;

Hu, Y. F. ;

Casa, D. ;

Nelson, C. S. ;

LaMarra, S. C. ;

Cao, G. ;

Kim, Young-June .

PHYSICAL REVIEW B, 2014, 89 (05)

[9] STRUCTURAL AND MAGNETIC STUDIES OF SR2IRO4 [J].

CRAWFORD, MK ;

SUBRAMANIAN, MA ;

HARLOW, RL ;

FERNANDEZBACA, JA ;

WANG, ZR ;

JOHNSTON, DC .

PHYSICAL REVIEW B, 1994, 49 (13) :9198-9201

[10] Neutron scattering study of correlated phase behavior in Sr2IrO4 [J].

Dhital, Chetan ;

Hogan, Tom ;

Yamani, Z. ;

de la Cruz, Clarina ;

Chen, Xiang ;

Khadka, Sovit ;

Ren, Zhensong ;

Wilson, Stephen D. .

PHYSICAL REVIEW B, 2013, 87 (14)

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