Pseudo Jahn-Teller Effect and Magnetoelastic Coupling in Spin-Orbit Mott Insulators

Abstract

The consequences of the Jahn-Teller (JT) orbital-lattice coupling for magnetism of pseudospin J_{eff}=1/2 and J_{eff}=0 compounds are addressed. In the former case, represented by Sr_2IrO_4, this coupling generates, through the so-called pseudo-JT effect, orthorhombic deformations of a crystal concomitant with magnetic ordering. The orthorhombicity axis is tied to the magnetization and rotates with it under magnetic field. The theory resolves a number of puzzles in Sr_2IrO_4 such as the origin of in-plane magnetic anisotropy and magnon gaps, metamagnetic transition, etc. In J_{eff}=0 systems, the pseudo-JT effect leads to spin-nematic transition well above magnetic ordering, which may explain the origin of `orbital order' in Ca_2RuO_4

arXiv commentminor revisions in the main text, Supplementary Material added, published version

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• Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4
• Spin-orbit entangled j=1/2 moments in Ba${}_2$CeIrO${}_6$ -- a frustrated fcc quantum magnet
• Observation of spin-orbit excitations and Hund's multiplets in Ca${}_2$RuO${}_4$
• Magnetoelastic coupling and effects of uniaxial strain in $\alpha$-RuCl${}_3$ from first principles
• Exchange interactions, Jahn-Teller coupling, and multipole orders in pseudospin one-half $5{\mathbf{d}}^2$ Mott insulators
• Strain-engineering of the charge and spin-orbital interactions in Sr2IrO4
• Dynamic Jahn-Teller effect in the strong spin-orbit coupling regime
• Towards Kitaev Spin Liquid in 3d Transition Metal Compounds
• Laser-Induced Transient Magnons in Sr3Ir2O7 Throughout the Brillouin Zone
• Interplay of the Jahn--Teller Effect and Spin-Orbit Coupling: The Case of Trigonal Vibronic Modes
• Spin-orbit-enhanced magnetic surface second-harmonic generation in Sr${}_2$IrO${}_4$
• The origin of magnetism in a supposedly nonmagnetic osmium oxide
• Lattice frustration in spin-orbit Mott insulator Sr3Ir2O7 at high pressure
• Comprehensive Control of Metamagnetic Transition of Antiferromagnetic Mott Insulator Sr2IrO4 by in-situ Anisotropic Strain
• Hidden orders in spin-orbit entangled correlated insulators
• Orientational order parameters for arbitrary quantum systems
• Orbital Symmetry and Orbital Excitations in High-$T_c$ Superconductors
• Competing spin-orbital singlet states in the 4$d^4$ honeycomb ruthenate Ag${}_3$LiRu${}_2$O${}_6$
• Vibronic excitations in resonant inelastic x-ray scattering spectra of K${}_2$RuCl${}_6$
• Sr${}_2$IrO${}_4$/Sr${}_3$Ir${}_2$O${}_7$ superlattice for a model 2D quantum Heisenberg antiferromagnet
• Ionic Charge Distributions in Silicon Atomic Wires
• Structural and Magnetic Transitions in the Planar Antiferromagnet Ba${}_4$Ir${}_3$O${}_{10}$
• Pseudospin-lattice coupling and electric control of the square-lattice iridate Sr2IrO4
• Hidden spin-orbital order in the Kitaev hyperhoneycomb $\beta$-Li${}_2$IrO${}_3$
• Controllable emergent spatial spin modulation in Sr2IrO4 by in situ shear strain
• A coherent phonon-induced hidden quadrupolar ordered state in Ca${}_2$RuO${}_4$
• Optical excitation of magnons in an easy-plane antiferromagnet: Application to Sr${}_2$IrO${}_4$
• Spinons and damped phonons in spin-1/2 quantum-liquid Ba${}_4$Ir${}_3$O${}_{10}$ observed by Raman scattering
• Momentum-resolved lattice dynamics of parent and electron-doped Sr${}_2$IrO${}_4$
• Dynamic Jahn-Teller Phenomena in Heavy Transition Metal Compounds
• Spin-orbital-lattice entanglement in the ideal j=1/2 compound K${}_2$IrCl${}_6$
• Ground state properties of the Heisenberg-compass model on the square lattice
• Modeling multiorbital effects in Sr2IrO4 under strain and a Zeeman field
• Tuning Crystal Field Potential by Orbital Dilution in $d^4$ Oxides
• Pulling order back from the brink of disorder: Observation of a nodal line spin liquid and fluctuation stabilized order in K${}_2$IrCl${}_6$
• Evolution of electronic and magnetic properties of Sr${}_2$IrO${}_4$ under strain
• Competition of three-dimensional magnetic phases in Ca${}_2$Ru${}_{1-x}$Fe${}_x$O${}_4$: A structural perspective
• Critical fluctuations in the spin-orbit Mott insulator Sr${}_3$Ir${}_2$O${}_7$
• Extended Lipkin-Meshkov-Glick Hamiltonian
• Microscopic model realization of $\mathbf{d}$-wave pseudospin current order in Sr${}_2$IrO${}_4$
• 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${}_7$
• Phase coexistence and negative thermal expansion in the triple perovskite iridate Ba${}_3$CoIr${}_2$O${}_9$