Persistent non-metallic behavior in Sr2IrO4 and Sr3Ir2O7 at high pressures

Abstract

Iridium-based 5d transition-metal oxides are attractive candidates for the study of correlated electronic states due to the interplay of enhanced crystal-field, Coulomb and spin-orbit interaction energies. At ambient pressure, these conditions promote a novel Jeff = 1/2 Mott insulating state, characterized by a gap of the order of ~0.1 eV. We present high-pressure electrical resistivity measurements of single crystals of Sr2IrO4 and Sr3Ir2O7. While no indications of a pressure-induced metallic state up to 55 GPa were found in Sr2IrO4, a strong decrease of the gap energy and of the resistance of Sr3Ir2O7 between ambient pressure and 104 GPa confirm that this compound is in the proximity of a metal-insulator transition.

5 pages, 4 figures

References in corpus (7)

• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5$d$ Transition Metal Oxides Sr${}_{n+1}$Ir${}_n$O${}_{3n+1}$ ($n$=1, 2, and $\infty$)
• Giant Magnon Gap in Bilayer Iridate Sr3Ir2O7: Enhanced Pseudo-dipolar Interactions Near the Mott Transition
• Dimensionality Driven Spin-Flop Transition in Layered Iridates
• Imaging the evolution of metallic states in a spin-orbit interaction driven correlated iridate
• Dimensionality controlled Mott transition and correlation effects in single- and bi-layer perovskite iridates
• Tuning Jeff = 1/2 Insulating State via Electron Doping and Pressure in Double-Layered Iridate Sr3Ir2O7

Cited by in corpus (24)

• The Challenge of Spin-Orbit-Tuned Ground States in Iridates
• Square Lattice Iridates
• Transfer of spectral weight across the gap of Sr2IrO4 induced by La doping
• Decoupling of the Antiferromagnetic and Insulating States in Tb doped Sr2IrO4
• Pressure-Induced Confined Metal from the Mott Insulator Sr3Ir2O7
• High-pressure versus isoelectronic doping effect on the honeycomb iridate Na${}_2$IrO${}_3$
• Persistent Insulator: Avoidance of Metallization at Megabar Pressures in Strongly Spin-Orbit-Coupled Sr2IrO4
• Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment
• First-order structural transition and pressure-induced lattice/phonon anomalies in Sr${}_2$IrO${}_4$
• Possible quantum paramagnetism in compressed Sr${}_2$IrO${}_4$
• Pressure dependence of the structure and electronic properties of Sr3Ir2O7
• Strain-modulated Slater-Mott crossover of pseudospin-half square-lattice in (SrIrO3)1/ (SrTiO3)1 superlattices
• Lattice frustration in spin-orbit Mott insulator Sr3Ir2O7 at high pressure
• Non-local Coulomb correlations in pure and electron-doped ${\mathrm{Sr}}_2{\mathrm{IrO}}_4$: spectral functions, Fermi surface and pseudogap-like spectral weight distributions from oriented cluster dynamical mean field theory
• High-pressure insulator-to-metal transition in Sr${}_3$Ir${}_2$O${}_7$ studied by x-ray absorption spectroscopy
• Structural evolution and electronic properties of (Sr1-xCax)2-yIrO4+z spin-orbit assisted insulators
• Pseudospin-lattice coupling and electric control of the square-lattice iridate Sr2IrO4
• Cooperative effects of lattice and spin-orbit coupling on the electronic structure of orthorhombic SrIrO3
• Influence of multiplet structure on photoemission spectra of spin-orbit driven Mott insulators: application to $\mathbf{S}{\mathbf{r}}_2\mathbf{Ir}{\mathbf{O}}_4$
• Decoupling of magnetism and electric transport in single-crystal (Sr1-xAx)2IrO4 (A = Ca or Ba)
• Single crystal growth of iridates without platinum impurities
• Anisotropic Lattice Compression and Pressure-Induced Electronic Phase Transitions in Sr${}_2$IrO${}_4$
• Magnetic order, disorder, and excitations under pressure in the Mott insulator Sr${}_2$IrO${}_4$
• Exploring the energy landscape of resistive switching in antiferromagnetic Sr(3)Ir(2)O(7)