Anisotropic exchange and spin-wave damping in pure and electron-doped Sr${}_2$IrO${}_4$

Abstract

The collective magnetic excitations in the spin-orbit Mott insulator (Sr${}_{1-x}$La${}_x$)${}_2$IrO${}_4$ ($x=0,0.01,0.04,0.1$) were investigated by means of resonant inelastic x-ray scattering. We report significant magnon energy gaps at both the crystallographic and antiferromagnetic zone centers at all doping levels, along with a remarkably pronounced momentum-dependent lifetime broadening. The spin-wave gap is accounted for by a significant anisotropy in the interactions between $J_{\text{eff}}=1/2$ isospins, thus marking the departure of Sr${}_2$IrO${}_4$ from the essentially isotropic Heisenberg model appropriate for the superconducting cuprates.

6 pages, 4 figures

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• Neutron scattering study of correlated phase behavior in Sr2IrO4
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Cited by in corpus (27)

• Fingerprints of Kitaev physics in the magnetic excitations of honeycomb iridates
• Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4
• Strain-engineering of the charge and spin-orbital interactions in Sr2IrO4
• Dispersive Magnetic and Electronic Excitations in Iridate Perovskites Probed with Oxygen $K$-Edge Resonant Inelastic X-ray Scattering
• Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment
• Spin-gap and two-dimensional magnetic excitations in Sr2IrO4
• Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO${}_{\text{3}}$
• BaOsO${}_3$: A Hund's metal in the presence of strong spin-orbit coupling
• Spin-wave gap collapse in Rh-doped Sr2IrO4
• Persistence of antiferromagnetic order upon La substitution in the $4d^4$ Mott insulator Ca${}_2$RuO${}_4$
• Decoupling of static and dynamic criticality in a driven Mott insulator
• Magnetic excitations in hole-doped Sr2IrO4: A comparison with electron-doped cuprates
• Resonant inelastic x-ray scattering of magnetic excitations under pressure
• Optical excitation of magnons in an easy-plane antiferromagnet: Application to Sr${}_2$IrO${}_4$
• Momentum-resolved lattice dynamics of parent and electron-doped Sr${}_2$IrO${}_4$
• Carrier density crossover and quasiparticle mass enhancement in a doped 5$d$ Mott insulator
• Quasi-2D anomalous Hall Mott insulator of topologically engineered Jeff =1/2 electrons
• Single laser pulse driven thermal limit of the quasi-two dimensional magnetic ordering in Sr${}_2$IrO${}_4$
• Magnon Spectra of Cuprates beyond Spin Wave Theory
• Correlated motion of particle-hole excitations across the renormalized spin-orbit gap in $\mathrm{S}{\mathrm{r}}_2\mathrm{Ir}{\mathrm{O}}_4$
• Pseudo-spin rotation symmetry breaking by Coulomb interaction terms in spin-orbit coupled systems
• Coupled spin-orbital fluctuations in a three orbital model for $4d$ and $5d$ oxides with electron fillings $n=3,4,5$ -- Application to $\mathrm{NaOs}{\mathrm{O}}_3$, $\mathrm{C}{\mathrm{a}}_2\mathrm{Ru}{\mathrm{O}}_4$, and $\mathrm{S}{\mathrm{r}}_2\mathrm{Ir}{\mathrm{O}}_4$
• Evolution of electronic and magnetic properties of Sr${}_2$IrO${}_4$ under strain
• A $j_{\mathrm{eff}}=1/2$ pseudospinon continuum in CaIrO${}_3$
• Spin and charge order in doped spin-orbit coupled Mott insulators
• Magnetism in artificial Ruddlesden-Popper iridates leveraged by structural distortions
• Fermi surface and pseudogap in highly doped Sr${}_2$IrO${}_4$