Tunable Semimetallic State in Compressive-strained SrIrO3 Films Revealed by Transport Behaviors

Abstract

Orthorhombic SrIrO3 is a typical spin-orbit-coupling correlated metal that shows diversified physical properties under the external stimuli. Here nonlinear Hall effect and weakly temperature-dependent resistance are observed in a SrIrO3 film epitaxially grown on SrTiO3 substrate. It infers that orthorhombic SrIrO3 is a semimetal oxide. However, linear Hall effect and insensitive-temperature-dependent resistance are observed in SrIrO3 films grown on (La,Sr)(Al,Ta)O3 (LSAT) substrates, suggesting a tunable semimetallic state due to band structure change in SrIrO3 films under different compressive strain. The mechanism of this evolution is explored in detail through strain-state analysis by reciprocal space mapping and electron diffraction, carrier density and mobility calculations, as well as electronic band structure evolution under compressive strain (predicted by tight-binding approximation). It might suggest that the strain-induced band shift leads to the semimetallic tuning in the SrIrO3 film grown on from SrTiO3 to LSAT substrates. Our findings illustrate the tunability of SrIrO3 properties and pave the way to induce novel physical states in SrIrO3 such as the proposed topological insulator state in heterostructures.

arXiv comment21 pages, 5 figures, submitted to PRB

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• Epitaxial growth and thermodynamic stability of SrIrO3/SrTiO3 heterostructures
• Review of Spin Orbit Coupled Semimetal SrIrO3 in thin film form
• Balanced electron-hole transport in spin-orbit semimetal SrIrO3 heterostructures
• Growth and engineering of perovskite SrIrO3 thin films
• Synthesis and electronic properties of Ruddlesden-Popper strontium iridate epitaxial thin films stabilized by control of growth kinetics
• Tunable and Enhanced Rashba Spin-Orbit Coupling in Iridate-Manganite Heterostructures
• Novel spin-orbit coupling driven emergent states in iridate-based heterostructures
• Magnetism at iridate/manganite interface: influence of strong spin-orbit interaction
• Structural properties and anisotropic electronic transport in SrIrO3 films
• Observation of Nonlinear Spin-Charge Conversion in the Thin Film of Nominally Centrosymmetric Dirac Semimetal SrIrO3 at Room Temperature
• Strange semimetal dynamics in SrIrO${}_3$
• Substrate-tuning of correlated spin-orbit oxides
• Thermoelectric behavior of Ruddlesden-Popper series iridates
• Abrupt Enhancement of Spin-Orbit Scattering Time in Ultrathin Semimetallic SrIrO${}_3$ Close to the Metal-Insulator Transition
• Persistent semi-metal-like nature of epitaxial perovskite CaIrO3 thin films
• Low temperature ferromagnetism in perovskite SrIrO${}_3$ films
• Magnetic properties of bilayer Sr${}_3$Ir${}_2$O${}_7$: role of epitaxial strain and oxygen vacancies
• Anisotropy and interaction effects of strongly strained SrIrO3 thin films
• Cooperative effects of lattice and spin-orbit coupling on the electronic structure of orthorhombic SrIrO3
• Suppression of twinning and enhanced electronic anisotropy of SrIrO3 films
• Emergence of non-Fermi liquid behaviors in 5d perovskite SrIrO3 thin films: interplay between correlation, disorder, and spin-orbit coupling
• Metal-Insulator Transitions and non-Fermi Liquid Behaviors in 5d Perovskite Iridates
• Anomalous pressure dependence of the electronic transport and anisotropy in SrIrO3 films
• Giant non-volatile electric field control of proximity induced magnetism in the spin-orbit semimetal SrIrO3