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

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