Critical fluctuations in the spin-orbit Mott insulator SrIrO
arXiv:1812.08682 · doi:10.1088/1361-648X/ab0471
Abstract
X-ray magnetic critical scattering measurements and specific heat measurements were performed on the perovskite iridate SrIrO. We find that the magnetic interactions close to the Néel temperature = 283.4(2) K are three-dimensional. This contrasts with previous studies which suggest two-dimensional behaviour like SrIrO. 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 SrIrO is representative of the diluted 3D Ising universality class.
arXiv commentAccepted in Journal of Physics: Condensed Matter
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