Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4

Abstract

The simultaneous presence of sizable spin-orbit interactions and electron correlations in iridium oxides has led to predictions of novel ground states including Dirac semimetals, Kitaev spin liquids, and superconductivity. Electron and hole doping studies of spin-orbit assisted Mott insulator Sr2IrO4 are being intensively pursued due to extensive parallels with the La2CuO4 parent compound of Cuprate superconductors. In particular, the mechanism of charge doping associated with replacement of Ir with Rh ions remains controversial with profound consequences for the interpretation of electronic structure and transport data. Using x-ray absorption near edge structure (XANES) measurements at the Rh L, K- and Ir L- edges we observe anomalous evolution of charge partitioning between Rh and Ir with Rh doping. The partitioning of charge between Rh and Ir sites progresses in a way that holes are initially doped into the Jeff=1/2 band at low x only to be removed from it at higher x values. This anomalous hole doping naturally explains the re-entrant insulating phase in the phase diagram of Rh doped Sr2IrO4 and ought to be considered when searching for superconductivity and other emergent phenomena in iridates doped with 4d elements

arXiv commentAccepted to be published in PRB Rapid Communications, https://journals.aps.org/prb/accepted/75073OcbL8cE901092c69c34262f259d8151b3cff

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Cited by in corpus (11)

• Square Lattice Iridates
• Formation of an incoherent metallic state in Rh-doped Sr${}_2$IrO${}_4$
• Electronic structure and optical properties of Sr${}_2$IrO${}_4$ under epitaxial strain
• Spin-wave gap collapse in Rh-doped Sr2IrO4
• 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${}_4$
• Origin of the different electronic structure of Rh- and Ru-doped Sr2IrO4
• Electronic structure of the frustrated diamond lattice magnet NiRh${}_2$O${}_4$
• 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
• Three-dimensional Stacking of Canted Antiferromagnetism and Pseudospin Current in Undoped Sr${}_2$IrO${}_4$: Symmetry Analysis and Microscopic Model Realization