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 $\infty$)

S. J. Moon; H. Jin; K. W. Kim; W. S. Choi; Y. S. Lee; J. Yu; G. Cao; A. Sumi; H. Funakubo; C. Bernhard; T. W. Noh

doi:10.1103/PhysRevLett.101.226402

paper

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 $\infty$ )

arXiv:0807.2136 · doi:10.1103/PhysRevLett.101.226402

Abstract

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 5d Transition Metal Oxides Srn+1​Irn​O3n+1​ (n=1, 2, and ∞)

Abstract

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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 $\infty$ )