Model analysis of magnetic susceptibility of Sr${}_2$IrO${}_4$ - 2D $J_{\mathrm{eff}}$ = 1/2 Heisenberg system with competing interlayer couplings

Abstract

We report the analysis of magnetic susceptibility $\chi$($T$) of Sr${}_2$IrO${}_4$ single crystal in the paramagnetic phase. We formulate the theoretical susceptibility based on isotropic Heisenberg antiferromagnetism incorporating the Dzyaloshinsky-Moriya interaction exactly, and include the interlayer couplings in a mean-field approximation. $\chi$($T$) above $T_{\mathrm{N}}$ was found to be well described by the model, indicating the predominant Heisenberg exchange consistent with the microscopic theory. The analysis points to a competition of nearest and next-nearest neighbor interlayer couplings, which results in the up-up-down-down configuration of the in-plane canting moments identified by the diffraction experiments.

8 pages, 5 figures

References in corpus (8)

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• Fermi Arcs in a Doped Pseudospin-1/2 Heisenberg Antiferromagnet
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• Spin-orbit-enhanced magnetic surface second-harmonic generation in Sr${}_2$IrO${}_4$
• Anomalous Magnetoresistance due to Longitudinal Spin Fluctuations in a Jeff = 1/2 Mott Semiconductor
• Flexomagnetoelectric effect in Sr2IrO4 thin films
• Controllable emergent spatial spin modulation in Sr2IrO4 by in situ shear strain
• Interlayer Coupling Induced Quasiparticles
• Strain tuned magnetotransport of Jeff=1/2 antiferromagnetic Sr2IrO4 thin films
• Modeling multiorbital effects in Sr2IrO4 under strain and a Zeeman field
• Structural origin of the Jeff=1/2 antiferromagnetic phase in Ga-doped Sr2IrO4
• Three-dimensional Stacking of Canted Antiferromagnetism and Pseudospin Current in Undoped Sr${}_2$IrO${}_4$: Symmetry Analysis and Microscopic Model Realization