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We report on the epitaxial strain-driven electronic and antiferromagneticmodulations of a pseudospin-half square lattice realized in superlattices of(SrIrO3)1/(SrTiO3)1. With increasing compressive strain, we find thelow-temperature insulating behavior to be strongly suppressed with acorresponding systematic reduction of both the Neel temperature and thestaggered moment. However, despite such a suppression, the system remainsweakly insulating above the Neel transition. The emergence of metallicity isobserved under large compressive strain but only at temperatures far above theN\'eel transition. These behaviors are characteristics of the Slater-Mottcrossover regime, providing a unique experimental model system of the spin-halfHubbard Hamiltonian with a tunable intermediate coupling strength.

Strain-modulated Slater-Mott crossover of pseudospin-half square-lattice in (SrIrO3)1/ (SrTiO3)1 superlattices