We report on the epitaxial strain-driven electronic and antiferromagnetic modulations of a pseudospin-half square-lattice realized in superlattices of (SrIrO_{3})_{1}/(SrTiO_{3})_{1}. With increasing compressive strain, we find the low-temperature insulating behavior to be strongly suppressed with a corresponding systematic reduction of both the Néel temperature and the staggered moment. However, despite such a suppression, the system remains weakly insulating above the Néel transition. The emergence of metallicity is observed under large compressive strain but only at temperatures far above the Néel transition. These behaviors are characteristics of the Slater-Mott crossover regime, providing a unique experimental model system of the spin-half Hubbard Hamiltonian with a tunable intermediate coupling strength.

Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA

Department of Condensed Matter Physics and Materials Science Brookhaven National Laboratory Upton New York 11973 USA

Department of Condensed Matter Physics Charles University Ke Karlovu 5 121 16 Prague Czech Republic

Department of Material Science and Engineering University of Tennessee Knoxville Tennessee 37996 USA

Department of Materials Science and Engineering University of California Berkeley California 94720 USA

Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA

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