Spin-gap and two-dimensional magnetic excitations in Sr2IrO4

Abstract

Time-of-flight inelastic neutron scattering measurements on Sr2IrO4 single crystals were performed to access the spin Hamiltonian in this canonical Jeff=1/2 spin-orbital Mott insulator. The momentum of magnetic scattering at all inelastic energies that were measured is revealed to be $L$-independent, indicative of idealized two-dimensional in-plane correlations. By probing the in-plane energy and momentum dependence up to ~80 meV we model the magnetic excitations and define a spin-gap of 0.6(1) meV. Collectively the results indicate that despite the strong spin-orbit entangled isospins an isotropic two-dimensional S=1/2 Heisenberg model Hamiltonian accurately describes the magnetic interactions, pointing to a robust analogy with unconventional superconducting cuprates.

References in corpus (12)

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• Neutron scattering study of correlated phase behavior in Sr2IrO4
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• Anisotropic exchange and spin-wave damping in pure and electron-doped Sr${}_2$IrO${}_4$
• Giant Spin Gap and Magnon Localization in the Disordered Heisenberg Antiferromagnet Sr2Ir1-xRuxO4
• Strong anisotropy within a Heisenberg model in the J=1/2 insulating state of Sr2Ir0.8Ru0.2O4

Cited by in corpus (13)

• Laser-Induced Transient Magnons in Sr3Ir2O7 Throughout the Brillouin Zone
• Possible quantum paramagnetism in compressed Sr${}_2$IrO${}_4$
• Comprehensive Control of Metamagnetic Transition of Antiferromagnetic Mott Insulator Sr2IrO4 by in-situ Anisotropic Strain
• Pseudospin-lattice coupling and electric control of the square-lattice iridate Sr2IrO4
• Magnetic excitations in hole-doped Sr2IrO4: A comparison with electron-doped cuprates
• Resonant inelastic x-ray scattering of magnetic excitations under pressure
• Overdamped antiferromagnetic strange metal state in Sr${}_3$IrRuO${}_7$
• 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${}_4$
• Magnetic excitations of Sr${}_3$Ir${}_2$O${}_7$ observed by inelastic neutron scattering measurement
• Microscopic model realization of $\mathbf{d}$-wave pseudospin current order in Sr${}_2$IrO${}_4$
• Using magnetic dynamics to measure the spin gap in a candidate Kitaev material
• Coexistence of insulator-like paramagnon and metallic spin-orbit exciton modes in SrIrO${}_3$