Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4

Abstract

Spin-orbit entangled magnetic dipoles, often referred to as pseudospins, provide a new avenue to explore novel magnetism inconceivable in the weak spin-orbit coupling limit, but the nature of their low-energy interactions remains to be understood. We present a comprehensive study of the static magnetism and low-energy pseudospin dynamics in the archetypal spin-orbit Mott insulator Sr2IrO4. We find that in order to understand even basic magnetization measurements, a formerly overlooked in-plane anisotropy is fundamental. In addition to magnetometry, we use neutron diffraction, inelastic neutron scattering and resonant elastic and inelastic x-ray scattering to identify and quantify the interactions that determine the global symmetry of the system and govern the linear responses of pseudospins to external magnetic felds and their low-energy dynamics. We find that a pseudospin-only Hamiltonian is insufficient for an accurate description of the magnetism in Sr2IrO4 and that pseudospin-lattice coupling is essential. This finding should be generally applicable to other pseudospin systems with sizable orbital moments sensitive to anisotropic crystalline environments.

arXiv commentMain text:11 pages, 12 figures Supplementary Material: 3 pages, 2 figures, 1 table

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• First-Principles Calculation of Spin and Orbital Contributions to Magnetically Ordered Moments in Sr${}_2$IrO${}_4$
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• Comprehensive Control of Metamagnetic Transition of Antiferromagnetic Mott Insulator Sr2IrO4 by in-situ Anisotropic Strain
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• Sr${}_2$IrO${}_4$/Sr${}_3$Ir${}_2$O${}_7$ superlattice for a model 2D quantum Heisenberg antiferromagnet
• Pseudospin-lattice coupling and electric control of the square-lattice iridate Sr2IrO4
• Structural and Magnetic Transitions in the Planar Antiferromagnet Ba${}_4$Ir${}_3$O${}_{10}$
• Isospin-phonon coupling and Fano-interference in spin-orbit Mott insulator Sr2IrO4
• Controllable emergent spatial spin modulation in Sr2IrO4 by in situ shear strain
• Optical excitation of magnons in an easy-plane antiferromagnet: Application to Sr${}_2$IrO${}_4$
• Strain tuned magnetotransport of Jeff=1/2 antiferromagnetic Sr2IrO4 thin films
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• Precise control of $J_{\mathrm{eff}}=1/2$ magnetic properties in Sr${}_2$IrO${}_4$ epitaxial thin films by variation of strain and thin film thickness
• Emergent interlayer magnetic order via strain-induced orthorhombic distortion in the 5d Mott insulator Sr2IrO4
• Correlated motion of particle-hole excitations across the renormalized spin-orbit gap in $\mathrm{S}{\mathrm{r}}_2\mathrm{Ir}{\mathrm{O}}_4$
• Modeling multiorbital effects in Sr2IrO4 under strain and a Zeeman field
• Single laser pulse driven thermal limit of the quasi-two dimensional magnetic ordering in Sr${}_2$IrO${}_4$
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• Observation of excitons bound by antiferromagnetic correlations
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• Quantum Criticality in a Layered Iridate
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• Three-dimensional Stacking of Canted Antiferromagnetism and Pseudospin Current in Undoped Sr${}_2$IrO${}_4$: Symmetry Analysis and Microscopic Model Realization
• Critical magnetic fluctuations in the layered ruthenates Ca${}_2$RuO${}_4$ and Ca${}_3$Ru${}_2$O${}_7$
• Giant anisotropic magnetoresistance with dual-four-fold symmetry in CaMnO3/CaIrO3 heterostructures
• Absence of temperature-dependent phonon anomalies in Sr2IrO4 and Sr3Ir2O7
• Phase coexistence and negative thermal expansion in the triple perovskite iridate Ba${}_3$CoIr${}_2$O${}_9$
• Emerging axion detection in artificial magnetoelectric materials