Critical fluctuations in the spin–orbit Mott insulator Sr3Ir2O7. (6th March 2019)

• Record Type: Journal Article
• Authors: Vale, J G; Boseggia, S; Walker, H C; Springell, R S; Hunter, E C; Perry, R S; Collins, S P; McMorrow, D F
• Is Part Of: Journal of physics. Volume 31:Number 18(2019)
• Publication Date: 2019-03-06
• Subjects: magnetic critical scattering -- iridates -- phase transitions; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ab0471
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: X-ray magnetic critical scattering measurements and specific heat measurements were performed on the perovskite iridate . We find that the magnetic interactions close to the Néel temperature are three-dimensional. This contrasts with previous studies which suggest two-dimensional behaviour like Sr2 IrO4 . Violation of the Harris criterion ( ) means that weak disorder becomes relevant. This leads a rounding of the antiferromagnetic phase transition at, and modifies the critical exponents relative to the clean system. Specifically, we determine that the critical behaviour of is representative of the diluted 3D Ising universality class.