Anisotropic softening of magnetic excitations in lightly electron doped Sr${}_2$IrO${}_4$

Abstract

The magnetic excitations in electron doped (Sr${}_{1-x}$La${}_x$)${}_2$IrO${}_4$ with $x=0.03$ were measured using resonant inelastic X-ray scattering at the Ir $L_3$-edge. Although much broadened, well defined dispersive magnetic excitations were observed. Comparing with the magnetic dispersion from the parent compound, the evolution of the magnetic excitations upon doping is highly anisotropic. Along the anti-nodal direction, the dispersion is almost intact. On the other hand, the magnetic excitations along the nodal direction show significant softening. These results establish the presence of strong magnetic correlations in electron doped Sr${}_{1-x}$La${}_x$)${}_2$IrO${}_4$ with close analogies to the hole doped cuprates, further motivating the search for high temperature superconductivity in this system.

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Cited by in corpus (24)

• The Challenge of Spin-Orbit-Tuned Ground States in Iridates
• Spin-orbit-entangled electronic phases in 4$d$ and 5$d$ transition-metal compounds
• Persistent paramagnons deep in the metallic phase of Sr${}_{2-x}$La${}_x$IrO${}_4$
• Two-dimensional $J_{\mathrm{eff}}$ = 1/2 antiferromagnetic insulator unraveled from interlayer exchange coupling in artificial perovskite iridate superlattices
• Strain-engineering of the charge and spin-orbital interactions in Sr2IrO4
• Raman scattering study of vibrational and magnetic excitations in Sr${}_{2-x}$La${}_x$IrO${}_4$
• Anisotropic exchange and spin-wave damping in pure and electron-doped Sr${}_2$IrO${}_4$
• Doping Evolution of Magnetic Order and Magnetic Excitations in (Sr${}_{1-x}$La${}_x$)${}_3$Ir${}_2$O${}_7$
• Correlation effects and hidden spin-orbit entangled electronic order in parent and electron-doped iridates Sr${}_2$IrO${}_4$
• Spin-gap and two-dimensional magnetic excitations in Sr2IrO4
• Magnetic excitations in a three-orbital model for the strongly spin-orbit coupled iridates: Effect of mixing between the J=1/2 and 3/2 sectors
• Disordered dimer state in electron-doped Sr${}_3$Ir${}_2$O${}_7$
• Spectroscopic evidence for electron-boson coupling in electron-doped Sr${}_2$IrO${}_4$
• Spin-wave gap collapse in Rh-doped Sr2IrO4
• Persistence of antiferromagnetic order upon La substitution in the $4d^4$ Mott insulator Ca${}_2$RuO${}_4$
• Magnetic excitations in hole-doped Sr2IrO4: A comparison with electron-doped cuprates
• Giant Spin Gap and Magnon Localization in the Disordered Heisenberg Antiferromagnet Sr2Ir1-xRuxO4
• Resonant inelastic x-ray scattering of magnetic excitations under pressure
• $J=1/2$ Pseudospins and $d$-$p$ Hybridization in the Kitaev Spin Liquid Candidates Ru$X_3$ ($X$ = Cl, Br, I)
• Strong anisotropy within a Heisenberg model in the J=1/2 insulating state of Sr2Ir0.8Ru0.2O4
• Quasi-2D anomalous Hall Mott insulator of topologically engineered Jeff =1/2 electrons
• Spin and charge order in doped spin-orbit coupled Mott insulators
• A $j_{\mathrm{eff}}=1/2$ pseudospinon continuum in CaIrO${}_3$
• Magnetism in artificial Ruddlesden-Popper iridates leveraged by structural distortions