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The orthorhombic perovskite SrIrO3 is a semimetal, an intriguing exception iniridates where the strong spin-orbit interaction coupled with electroncorrelations tends to impose a novel insulating state. We report results of ourinvestigation of bulk single-crystal Sr0.94Ir0.78O2.68 or Ir-deficient,orthorhombic perovskite SrIrO3. It retains the same crystal structure asstoichiometric SrIrO3 but exhibits a sharp, simultaneous antiferromagnetic(AFM) and metal-insulator (MI) transition at 185 K. Above it, the basal-planeresistivity features an extended regime of almost linear-temperature dependenceup to 800 K but the strong electronic anisotropy renders an insulating behaviorin the out-of-plane resistivity. The Hall resistivity undergoes an abrupt signchange and grows below 40 K, which along with the Sommerfeld constant of 20mJ/mole K2 suggests a multiband effect. All results including ourfirst-principles calculations underscore a delicacy of the metallic state inSrIrO3 that is in close proximity to an AFM insulating state. The contrastingground states in isostructural Sr0.94Ir0.78O2.68 and SrIrO3 illustrate acritical role of even slight lattice distortions in rebalancing the groundstate in the iridates. Finally, the observed simultaneous AFM and MItransitions reveal a direct correlation between the magnetic transition andformation of a charge gap in the iridate, which is conspicuously absent inSr2IrO4.

Simultaneous Metal-Insulator and Antiferromagnetic Transitions in Orthorhombic Perovskite Iridate Sr0.94Ir0.78O2.68 Single Crystals