Magnetic critical properties and basal-plane anisotropy of Sr${}_2$IrO${}_4$

Abstract

The anisotropic magnetic properties of Sr${}_2$IrO${}_4$ are investigated, using longitudinal and torque magnetometry. The critical scaling across $T_c$ of the longitudinal magnetization is the one expected for the 2D XY universality class. Modeling the torque for a magnetic field in the basal-plane, and taking into account all in-plane and out-of-plane magnetic couplings, we derive the effective 4-fold anisotropy $K_4\approx$ 1 10${}^5$ erg mole${}^{-1}$. Although larger than for the cuprates, it is found too small to account for a significant departure from the isotropic 2D XY model. The in-plane torque also allows us to put an upper bound for the anisotropy of a field-induced shift of the antiferromagnetic ordering temperature.

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Cited by in corpus (5)

• Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4
• Bond Directional Anapole Order in a Spin-Orbit Coupled Mott Insulator Sr${}_2$(Ir${}_{1-x}$Rh${}_x$)O${}_4$
• Magnetization density distribution of Sr${}_2$IrO${}_4$: Deviation from a local $j_{\text{eff}}=1/2$ picture
• Comprehensive Control of Metamagnetic Transition of Antiferromagnetic Mott Insulator Sr2IrO4 by in-situ Anisotropic Strain
• Insight into the magnetic behavior of Sr${}_2$IrO${}_4$:A spontaneous magnetization study