Structural distortion-induced magnetoelastic locking in Sr(2)IrO(4) revealed through nonlinear optical harmonic generation

Physical Review Letters
Darius H TorchinskyDavid Hsieh

Abstract

We report a global structural distortion in Sr_{2}IrO_{4} 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 Néel 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 Sr_{2}IrO_{4}.

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Citations

Apr 25, 2017·Nature Communications·Jaehong JeongPhilippe Bourges
Jan 23, 2018·Reports on Progress in Physics·Gang Cao, Pedro Schlottmann
Sep 11, 2018·Physical Chemistry Chemical Physics : PCCP·Kensei TerashimaNaurang Lal Saini
Jun 17, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Gang Cao
Sep 3, 2020·Advanced Materials·Mengmeng WeiWei Qin
Mar 22, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jiemin LiX Liu
Jan 16, 2019·Optics Express·Baozhu Lu, Darius H Torchinsky
Jun 4, 2019·The Review of Scientific Instruments·Baozhu LuDarius H Torchinsky

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