The importance of XY anisotropy in Sr2IrO4 revealed by magnetic critical scattering experiments

Abstract

The magnetic critical scattering in Sr${}_2$IrO${}_4$ has been characterized using X-ray resonant magnetic scattering (XRMS) both below and above the 3D antiferromagnetic ordering temperature, T${}_{\text{N}}$. The order parameter critical exponent below T${}_{\text{N}}$ is found to be β=0.195(4), in the range of the 2D XYh${}_4$ universality class. Over an extended temperature range above T${}_{\text{N}}$, 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 La${}_2$CuO${}_4$ and related systems. Our study therefore establishes the importance of XY anisotropy in the low-energy effective Hamiltonian of Sr${}_2$IrO${}_4$, the prototypical spin-orbit Mott insulator.

6 pages, 4 figures

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• Probing single magnon excitations in Sr${}_2$IrO${}_4$ using O $K$-edge resonant inelastic X-ray scattering

Cited by in corpus (37)

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• Strain-engineering of the charge and spin-orbital interactions in Sr2IrO4
• The Jeff=1/2 antiferromagnet Sr2IrO4: A golden avenue toward new physics and functions
• Dispersive Magnetic and Electronic Excitations in Iridate Perovskites Probed with Oxygen $K$-Edge Resonant Inelastic X-ray Scattering
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• Validity and limitations of the superexchange model for the magnetic properties of Sr2IrO4 and Ba2IrO4 mediated by the strong spin-orbit coupling
• Novel spin-orbit coupling driven emergent states in iridate-based heterostructures
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• Comprehensive Control of Metamagnetic Transition of Antiferromagnetic Mott Insulator Sr2IrO4 by in-situ Anisotropic Strain
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• Magnetic excitations in hole-doped Sr2IrO4: A comparison with electron-doped cuprates
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• Insight into the magnetic behavior of Sr${}_2$IrO${}_4$:A spontaneous magnetization study
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• Magnon Spectra of Cuprates beyond Spin Wave Theory
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• Evolution of electronic and magnetic properties of Sr${}_2$IrO${}_4$ under strain
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• Critical magnetic fluctuations in the layered ruthenates Ca${}_2$RuO${}_4$ and Ca${}_3$Ru${}_2$O${}_7$
• Possibility of an unconventional spin state of Ir${}^{4+}$ in Ba${}_{21}$Ir${}_9$O${}_{43}$ single crystal