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Critical fluctuations in the spin-orbit Mott Insulator Sr₃Ir₂O₇

Vale, JG; Walker, HC; Springell, R; Hunter, E; Perry, RS; McMorrow, DF; Boseggia, S; (2019) Critical fluctuations in the spin-orbit Mott Insulator Sr₃Ir₂O₇. Journal of Physics: Condensed Matter , 31 , Article 185803. 10.1088/1361-648X/ab0471. Green open access

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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 N´eel temperature T_{N} = 283.4(2) K are threedimensional. This contrasts with previous studies which suggest two-dimensional behaviour like Sr₃IrO₄. Violation of the Harris criterion (dν > 2) means that weak disorder becomes relevant. This leads a rounding of the antiferromagnetic phase transition at T_{N}, and modifies the critical exponents relative to the clean system. Specifically, we determine that the critical behaviour of Sr₃Ir₂O₇ is representative of the diluted 3D Ising universality class.

Type: Article
Title: Critical fluctuations in the spin-orbit Mott Insulator Sr₃Ir₂O₇
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1361-648X/ab0471
Publisher version: http://dx.doi.org/10.1088/1361-648X/ab0471
Language: English
Additional information: © 2019 IOP Publishing Ltd. As the Version of Record of this article is going to be/has been published on a gold open access basis under a CC BY 3.0 licence, this Accepted Manuscript is available for reuse under a CC BY 3.0 licence immediately.
Keywords: Magnetic critical scattering, Iridates, Phase transitions
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/10067641
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