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Importance of XY anisotropy in Sr2IrO4 revealed by magnetic critical scattering experiments

Vale, JG; Boseggia, S; Walker, HC; Springell, R; Feng, Z; Hunter, EC; Perry, RS; ... McMorrow, DF; + view all (2015) Importance of XY anisotropy in Sr2IrO4 revealed by magnetic critical scattering experiments. Physical Review B , 92 (2) , Article 020406(R). 10.1103/PhysRevB.92.020406. Green open access

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Abstract

The 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 TN. The order parameter critical exponent below TN is found to be β=0.195(4), in the range of the two-dimensional (2D) XYh4 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.

Type: Article
Title: Importance of XY anisotropy in Sr2IrO4 revealed by magnetic critical scattering experiments
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.92.020406
Publisher version: http://dx.doi.org/10.1103/PhysRevB.92.020406
Language: English
Additional information: Copyright © 2015 American Physical Society.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1480314
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