Slaving of the magnetic moment canting to the correlated oxygen rotation in Sr2IrO4 revealed by X-ray resonant scattering

S. Boseggia, H. C. Walker, J. Vale, R. Springell, Z. Feng, M. Moretti Sala, H. M. Rønnow, S. P. Collins, D. F. McMorrow

Research output: Contribution to journalArticle (Academic Journal)peer-review

69 Citations (Scopus)

Abstract

Sr2IrO4 is a prototype of the class of Mott insulators in the strong spin-orbit interaction (SOI) limit described by a $J_{\mathrm{eff}}=1/2$ ground state. In Sr2IrO4, the strong SOI is predicted to manifest itself in the slaving of the canting of the magnetic moments to the correlated rotation by 11.8(1)$^{\circ}$ of the oxygen octahedra that characterizes its distorted layered perovskite structure. Using X-ray resonant scattering at the Ir $L_3$ 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)$^{\circ}$. 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 $J_{\mathrm{eff}}=1/2$ state
Original languageEnglish
JournalJournal of Physics Condensed Matter
DOIs
Publication statusPublished - 29 Aug 2013

Bibliographical note

9 pages, 5 figures

Keywords

  • cond-mat.str-el

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