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Critical fluctuations in the spin–orbit Mott insulator Sr3Ir2O7

DOI: 10.1088/1361-648X/ab0471 DOI Help

Authors: J. G. Vale (University College London (UCL); École Polytechnique Fédérale de Lausanne (EPFL)) , S. Boseggia (University College London (UCL); Diamond Light Source) , H. C. Walker (Deutsches Elektronen Synchrotron DESY; ISIS Neutron and Muon Source) , R. S. Springell (University of Bristol) , E. C. Hunter (The University of Edinburgh) , R. S. Perry (University College London (UCL)) , S. P. Collins (Diamond Light Source) , D. F. Mcmorrow (University College London (UCL))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter , VOL 31

State: Published (Approved)
Published: May 2019
Diamond Proposal Number(s): 7798 , 12911

Open Access Open Access

Abstract: X-ray magnetic critical scattering measurements and specific heat measurements were performed on the perovskite iridate Sr3Ir2O7. We find that the magnetic interactions close to the Néel temperature Tn = 283.4(2) K are three-dimensional. This contrasts with previous studies which suggest two-dimensional behaviour like Sr2IrO4. Violation of the Harris criterion (dv > 2) means that weak disorder becomes relevant. This leads a rounding of the antiferromagnetic phase transition at Tn, and modifies the critical exponents relative to the clean system. Specifically, we determine that the critical behaviour of Sr2Ir2O7 is representative of the diluted 3D Ising universality class.

Subject Areas: Physics, Materials


Beamlines: I16-Materials and Magnetism

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