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Tuning the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>J</mml:mi><mml:mi>eff</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:math>insulating state via electron doping and pressure in the double-layered iridate Sr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>Ir<mml:math xmlns:mml="http…
Sr${}_{3}$Ir${}_{2}$O${}_{7}$ exhibits a novel ${J}_{\mathrm{eff}}=\frac{1}{2}$ insulating state that features a splitting between ${J}_{\mathrm{eff}}=\frac{1}{2}$ and $\frac{3}{2}$ bands due to spin-orbit interaction. We report a metal-insulator transition in Sr${}_{3}$Ir${}_{2}$O${}_{7}$ via either dilute electron doping (La${}^{3+}$ for Sr${}^{2+}$) or application of high pressure up to 35 GPa. Our study of single-crystal Sr${}_{3}$Ir${}_{2}$O${}_{7}$ and …