The electronic structure of epitaxially stabilized 5d perovskite Ca_{1-x}Sr_xIrO_3 (x = 0, 0.5, and 1) thin films: the role of strong spin-orbit coupling

Abstract

We have investigated the electronic structure of meta-stable perovskite Ca1-xSrxIrO3 (x = 0, 0.5, and 1) thin films using transport measurements, optical spectroscopy, and first-principles calculations. We artificially fabricated the perovskite phase of Ca1-xSrxIrO3, which has a hexagonal or post perovskite crystal structure in bulk form, by growing epitaxial thin films on perovskite GdScO3 substrates using epi-stabilization technique. The transport properties of the perovskite Ca1-xSrxIrO3 films systematically changed from nearly insulating (or semi-metallic) for x = 0 to bad metallic for x = 1. Due to the extended wavefunctions, 5d electrons are usually delocalized. However, the strong spin-orbit coupling in Ca1-xSrxIrO3 results in the formation of effective total angular momentum Jeff = 1/2 and 3/2 states, which puts Ca1-xSrxIrO3 in the vicinity of a metal-insulator phase boundary. As a result, the electrical properties of the Ca1-xSrxIrO3 films are found to be sensitive to x and strain.

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References in corpus (11)

• 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 $\infty$)
• Strong spin-orbit coupling effects on the Fermi surface of Sr2RuO4 and Sr2RhO4
• Ferromagnetism in the Mott insulator Ba2NaOsO6
• Coulomb-Enhanced Spin-Orbit Splitting: The Missing Piece in the Sr2RhO4 Puzzle
• Non-Fermi-liquid behavior in nearly ferromagnetic metallic SrIrO3 single crystals
• Electronic structures of layered perovskite Sr2MO4 (M=Ru, Rh, and Ir)
• Cooperative Effect of Electron Correlation and Spin-Orbit Coupling on the Electronic and Magnetic Properties of Ba2NaOsO6
• Electronic structure of the pyrochlore metals Cd2Os2O7 and Cd2Re2O7
• Partial antiferromagnetism in spin-chain Sr5Rh4O12, Ca5Ir3O12 and Ca4IrO6 single crystals
• Enhanced paramagnetism of the 4d itinerant electrons in the rhodium oxide perovskite SrRhO3

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• Fabrication of (111)-oriented Ca0.5Sr0.5IrO3/SrTiO3 superlattices; a designed playground for honeycomb physics
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• Correlated Quantum Phenomena of Spin-Orbit Coupled Perovskite Oxide Heterostructures: Cases of SrRuO3 and SrIrO3-Based Artificial Superlattices
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• Hidden structural transition in epitaxial Ca${}_{0.5}$Sr${}_{0.5}$IrO${}_3$/SrTiO${}_3$ thin film