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 $\infty$)

Abstract

We investigated the electronic structures of the 5$d$ Ruddlesden-Popper series Sr${}_{n+1}$Ir${}_n$O${}_{3n+1}$ ($n$=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.

References in corpus (10)

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• Orbital-selective Mass Enhancements in Multi-band Ca${}_{2-x}$Sr${}_x$RuO${}_4$ Systems Analyzed by the Extended Drude Model

Cited by in corpus (229)

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