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Locking of iridium magnetic moments to the correlated rotation of oxygen octahedra in Sr2IrO4

DOI: 10.1088/0953-8984/25/42/422202 DOI Help
PMID: 24067396 PMID Help

Authors: S. Boseggia (University College London; Diamond Light Source) , H. C. Walker (Deutsches Elektronen-Synchrotron DESY) , J. Vale (University College London; École Polytechnique Fédérale de Lausanne (EPFL)) , Ross Springell (University of Bristol) , Z. Feng (University College London) , R. S. Perry (University of Edinburgh) , M. Moretti Sala (European Synchrotron Radiation Facility) , H. M. Rønnow (École Polytechnique Fédérale de Lausanne (EPFL)) , S. P. Collins (Diamond Light Source) , D. F. Mcmorrow (University College London; Technical University of Denmark)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter , VOL 25 (42) , PAGES 422202

State: Published (Approved)
Published: October 2013
Diamond Proposal Number(s): 8407

Abstract: Sr2IrO4 is a prototype of the class of Mott insulators in the strong spin–orbit interaction (SOI) limit described by a Jeff = 1/2 ground state. In Sr2IrO4, the strong SOI is predicted to manifest itself in the locking of the canting of the magnetic moments to the correlated rotation by 11.8(1)° of the oxygen octahedra that characterizes its distorted layered perovskite structure. Using x-ray resonant scattering at the Ir L3 edge we have measured accurately the intensities of Bragg peaks arising from different components of the magnetic structure. From a careful comparison of integrated intensities of peaks due to basal-plane antiferromagnetism, with those due to b-axis ferromagnetism, we deduce a canting of the magnetic moments of 12.2(8)°. We thus confirm that in Sr2IrO4 the magnetic moments rigidly follow the rotation of the oxygen octahedra, indicating that, even in the presence of significant non-cubic structural distortions, it is a close realization of the Jeff = 1/2 state.

Keywords: Antiferromagnetism; Bragg Curve; Comparative Evaluations; Ferromagnetism; Ground States; Iridium; Iridium Oxides; Magnetic Moments; Oxygen; Perovskite; Resonance Scattering; Rotation; Strontium Compounds; X Radiation

Subject Areas: Physics, Materials


Beamlines: I16-Materials and Magnetism