Time-reversal symmetry breaking hidden order in Sr${}_2$(Ir,Rh)O${}_4$

Abstract

Layered 5$d$ transition iridium oxides, Sr${}_2$(Ir,Rh)O${}_4$, are described as unconventional Mott insulators with strong spin-orbit coupling. The undoped compound, Sr${}_2$IrO${}_4$, is a nearly ideal two-dimensional pseudospin-$1/2$ Heisenberg antiferromagnet, similarly to the insulating parent compound of high-temperature superconducting copper oxides. Using polarized neutron diffraction, we here report a hidden magnetic order in pure and doped Sr${}_2$(Ir,Rh)O${}_4$, distinct from the usual antiferromagnetic pseudo-spin ordering. We find that time-reversal symmetry is broken while the lattice translation invariance is preserved in the hidden order phase. The onset temperature matches that of the odd-parity hidden order recently highlighted using optical second harmonic generation experiments. The novel magnetic order and broken symmetries can be explained by the loop-current model, previously predicted for the copper oxide superconductors.

arXiv comment7 figures: 3 in main text and 4 in the supplementary materials

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Cited by in corpus (53)

• The Challenge of Spin-Orbit-Tuned Ground States in Iridates
• Square Lattice Iridates
• Evidence of a hidden flux phase in the topological kagome metal CsV${}_3$Sb${}_5$
• Unified description of electronic orderings and cross correlations by complete multipole representation
• Theory of Orbital Magnetic Quadrupole Moment and Nonlinear Anomalous Thermoelectric Transport
• Control of chiral orbital currents in a colossal magnetoresistance material
• Anapole superconductivity from $\mathcal{P}\mathcal{T}$-symmetric mixed-parity interband pairing
• Unidirectional spin density wave state in metallic (Sr1-xLax)2IrO4
• The Jeff=1/2 antiferromagnet Sr2IrO4: A golden avenue toward new physics and functions
• Loop currents in quantum matter
• Correlation effects and hidden spin-orbit entangled electronic order in parent and electron-doped iridates Sr${}_2$IrO${}_4$
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• Quantum-geometry-induced anapole superconductivity
• Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment
• Quantum spin nematic phase in a square-lattice iridate
• Insulators and metals with topological order and discrete symmetry breaking
• Spin-orbit-enhanced magnetic surface second-harmonic generation in Sr${}_2$IrO${}_4$
• Thermodynamic approach to electric quadrupole moments
• Bond Directional Anapole Order in a Spin-Orbit Coupled Mott Insulator Sr${}_2$(Ir${}_{1-x}$Rh${}_x$)O${}_4$
• Photocurrent response in parity-time symmetric current-ordered states
• ARPES study of orbital characters, symmetry breakings and pseudogaps in doped and pure Sr2IrO4
• Ordering Kinetics in the Active Model B
• Emergence of Charge Loop Current in Geometrically Frustrated Hubbard Model: Functional Renormalization Group Study
• Magnetization density distribution of Sr${}_2$IrO${}_4$: Deviation from a local $j_{\text{eff}}=1/2$ picture
• Loop Currents in Two-leg Ladder Cuprates
• Emergent orbital magnetization in Kitaev quantum magnets
• Quantum theory of the Intrinsic Orbital Magnetoelectric Effect in itinerant electron systems at finite temperatures
• Hidden Magnetic Texture in the Pseudogap Phase of High-Tc $YB{a}_{2}C{u}_3{O}_{6.6}$
• Search for orbital magnetism in the kagome superconductor $\mathrm{Cs}{\mathrm{V}}_3\mathrm{S}{\mathrm{b}}_5$ using neutron diffraction
• Sr${}_2$IrO${}_4$/Sr${}_3$Ir${}_2$O${}_7$ superlattice for a model 2D quantum Heisenberg antiferromagnet
• Decoupling of static and dynamic criticality in a driven Mott insulator
• Optical Signature of a Crossover from Mott- to Slater-type Gap in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$
• Thermal Hall effect in the pseudogap phase of cuprates
• Magnetic excitations in hole-doped Sr2IrO4: A comparison with electron-doped cuprates
• Unusual slow magnetic fluctuations and critical slowing down in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$
• Controllable emergent spatial spin modulation in Sr2IrO4 by in situ shear strain
• Engineering Quantum Spin Liquids and Many-Body Majorana States with a Driven Superconducting Box Circuit
• Domain Growth in the Active Model B: Critical and Off-critical Composition
• $d$- and $p$-wave quantum liquid crystal orders in cuprate superconductors, $\kappa$-(BEDT-TTF)${}_2$X, and coupled chain Hubbard models: functional-renormalization-group analysis
• Influence of multiplet structure on photoemission spectra of spin-orbit driven Mott insulators: application to $\mathbf{S}{\mathbf{r}}_2\mathbf{Ir}{\mathbf{O}}_4$
• Muon Spin Relaxation and fluctuating magnetism in the pseudogap phase of YBa${}_2$Cu${}_3$O${}_y$
• Determination of the local structure of Sr${}_{2-x}$M${}_x$IrO${}_4$ (M = K, La) as a function of doping and temperature
• 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
• Polarized Raman spectroscopy study of metallic $(S{r}_{1-x}L{a}_x{)}_{3}I{r}_2{O}_7$: a consistent picture of disorder-interrupted unidirectional charge order
• Domain Growth Kinetics in Active Binary Mixtures
• Spin loop-current textures in Hubbard models
• Local magnetic moments due to loop currents in metals
• A $j_{\mathrm{eff}}=1/2$ pseudospinon continuum in CaIrO${}_3$
• Orbital current signature using neutron diffraction
• 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
• Orbital-Selective Spin-Orbit Mott Insulator in Fractional Valence Iridate La${}_3$Ir${}_3$O${}_{11}$
• Microscopic evidence for imaginary charge density wave in a kagome metal