Formation of an incoherent metallic state in Rh-doped Sr${}_2$IrO${}_4$

Abstract

Sr${}_2$IrO${}_4$ is the archetype of the spin-orbit Mott insulator, but the nature of the metallic states that may emerge from this type of insulator is still not very well known. We study with angle-resolved photoemission the insulator-to-metal transition observed in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$ when Ir is substituted by Rh (0.02 < $x$ < 0.35). The originality of the Rh doping is that Ir and Rh, which are formally isovalent, adopt different charge states, a rather unusual and inhomogeneous situation. We show that the evolution to the metallic state can be essentially understood as a shift of the Fermi level into the lower Hubbard band of Sr${}_2$IrO${}_4$. The Mott gap appears quite insensitive to the introduction of up to $\sim$20\% holes in this band. The metallic phase, which forms for $x$ > 0.07, is not a Fermi liquid. It is characterized by the absence of quasiparticles, unrenormalized band dispersion compared to calculations and an $\sim$30-meV pseudo-gap on the entire Fermi surface.

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Cited by in corpus (15)

• Square Lattice Iridates
• Spin-orbit-controlled metal-insulator transition in Sr${}_2$IrO${}_4$
• 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
• Impurity-induced phonon thermal Hall effect in the antiferromagnetic phase of Sr2IrO4
• Spin-wave gap collapse in Rh-doped Sr2IrO4
• Magnetic excitations in hole-doped Sr2IrO4: A comparison with electron-doped cuprates
• Optical Signature of a Crossover from Mott- to Slater-type Gap in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$
• Origin of the different electronic structure of Rh- and Ru-doped Sr2IrO4
• Coherent and incoherent bands in La and Rh doped Sr3Ir2O7
• Constraints on the two-dimensional pseudo-spin 1/2 Mott insulator description of Sr${}_2$IrO${}_4$
• The "dark phase'' in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$ revealed by Seebeck and Hall measurements
• Quantum Criticality in a Layered Iridate
• Evolution of the spectral lineshape at the magnetic transition in Sr2IrO4 and Sr3Ir2O7