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Transition metal oxides, in particular, 3d or 4d perovskites have provideddiverse emergent physics that originates from the coupling of various degreesof freedom such as spin, lattice, charge, orbital, and also disorder. 5dperovskites form a distinct class because they have strong spin-orbit couplingthat introduces to the system an additional energy scale that is comparable tobandwidth and Coulomb correlation. Consequent new physics includes novel Jeff =1/2 Mott insulators, metal-insulator transitions, spin liquids, and topologicalinsulators. After highlighting some of the phenomena appearing inRuddlesden-Popper iridate series Srn+1IrnO3n+1, we focus on the transportproperties of perovskite SrIrO3. Using epitaxial thin films on varioussubstrates, we demonstrate that metal-insulator transitions can be induced inperovskite SrIrO3 by reducing its thickness or by imposing compressive strain.The metal-insulator transition driven by thickness reduction is due todisorder, but the metal-insulator transition driven by compressive strain isaccompanied by peculiar non-Fermi liquid behaviors, possibly due to thedelicate interplay between correlation, disorder, and spin-orbit coupling. Weexamine various theoretical frameworks to understand the non-Fermi liquidphysics and metal-insulator transition that occurs in SrIrO3 and offer theMott-Anderson-Griffiths scenario as a possible solution.

Metal-Insulator Transitions and non-Fermi Liquid Behaviors in 5d Perovskite Iridates