Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5$d$ Transition Metal Oxides Sr$_{n+1}$Ir$_{n}$O$_{3n+1}$ ($n$=1, 2, and $\infty$)

We investigated the electronic structures of the 5 $d$ Ruddlesden-Popper series Sr $_{n + 1}$ Ir $_{n}$ O $_{3 n + 1}$ ( $n$ =1, 2, and $\infty$ ) using optical spectroscopy and first-principles calculations. As 5 $d$ orbitals are spatially more extended than 3 $d$ or 4 $d$ orbitals, it has been widely accepted that correlation effects are minimal in 5 $d$ compounds. However, we observed a bandwidth-controlled transition from a Mott insulator to a metal as we increased $n$ . In addition, the artificially synthesized perovskite SrIrO $_{3}$ showed a very large mass enhancement of about 6, indicating that it was in a correlated metallic state.

Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5 $d$ Transition Metal Oxides Sr $_{n + 1}$ Ir $_{n}$ O $_{3 n + 1}$ ( $n$ =1, 2, and $\infty$ )

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Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5 $d$ Transition Metal Oxides Sr $_{n + 1}$ Ir $_{n}$ O $_{3 n + 1}$ ( $n$ =1, 2, and $\infty$ )

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Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5dd Transition Metal Oxides Srn+1n+1​Irnn​O3n+13n+1​ (nn=1, 2, and ∞∞)

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Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5dd Transition Metal Oxides Srn+1n+1​Irnn​O3n+13n+1​ (nn=1, 2, and ∞∞)

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Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5 $d$ Transition Metal Oxides Sr $_{n + 1}$ Ir $_{n}$ O $_{3 n + 1}$ ( $n$ =1, 2, and $\infty$ )

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Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5 $d$ Transition Metal Oxides Sr $_{n + 1}$ Ir $_{n}$ O $_{3 n + 1}$ ( $n$ =1, 2, and $\infty$ )

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