000212184 001__ 212184
000212184 005__ 20190317000302.0
000212184 0247_ $$2doi$$a10.1103/PhysRevB.92.020406
000212184 022__ $$a1098-0121
000212184 02470 $$2ISI$$a000358030900002
000212184 037__ $$aARTICLE
000212184 245__ $$aImportance of XY anisotropy in Sr2IrO4 revealed by magnetic critical scattering experiments
000212184 269__ $$a2015
000212184 260__ $$bAmerican Physical Society$$c2015$$aCollege Pk
000212184 300__ $$a5
000212184 336__ $$aJournal Articles
000212184 520__ $$aThe magnetic critical scattering in Sr2IrO4 has been characterized using x-ray resonant magnetic scattering (XRMS) both below and above the three-dimensional antiferromagnetic ordering temperature T-N. The order parameter critical exponent below TN is found to be beta = 0.195(4), in the range of the two-dimensional (2D) XYh(4) universality class. Over an extended temperature range above TN, the amplitude and correlation length of the intrinsic critical fluctuations are well described by the 2D Heisenberg model with XY anisotropy. This contrasts with an earlier study of the critical scattering over a more limited range of temperature, which found agreement with the theory of the isotropic 2D Heisenberg quantum antiferromagnet, developed to describe the critical fluctuations of the conventional Mott insulator La2CuO4 and related systems. Our study therefore establishes the importance of XY anisotropy in the low-energy effective Hamiltonian of Sr2IrO4, the prototypical spin-orbit Mott insulator.
000212184 700__ $$uUCL, London Ctr Nanotechnol, London WC1E 6BT, England$$aVale, J. G.
000212184 700__ $$aBoseggia, S.
000212184 700__ $$uDeutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany$$aWalker, H. C.
000212184 700__ $$uUniv Bristol, Sch Phys, Interface Anal Ctr, Bristol BS2 8BS, Avon, England$$aSpringell, R.
000212184 700__ $$uUCL, London Ctr Nanotechnol, London WC1E 6BT, England$$aFeng, Z.
000212184 700__ $$uCtr Sci Extreme Condit, Edinburgh EH9 3FD, Midlothian, Scotland$$aHunter, E. C.
000212184 700__ $$uUCL, London Ctr Nanotechnol, London WC1E 6BT, England$$aPerry, R. S.
000212184 700__ $$uUniv Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England$$aPrabhakaran, D.
000212184 700__ $$uUniv Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England$$aBoothroyd, A. T.
000212184 700__ $$uDiamond Light Source Ltd, Didcot OX11 0DE, Oxon, England$$aCollins, S. P.
000212184 700__ $$0243430$$g176429$$aRønnow, Henrik M.
000212184 700__ $$aMcmorrow, D. F.
000212184 773__ $$j92$$tPhysical Review B$$k2$$q020406
000212184 8564_ $$uhttp://lqm.epfl.ch/$$zURL
000212184 8564_ $$uhttps://infoscience.epfl.ch/record/212184/files/PhysRevB.92.020406.pdf$$zn/a$$s648831$$yn/a
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000212184 937__ $$aEPFL-ARTICLE-212184
000212184 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000212184 980__ $$aARTICLE