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Dimensionality-Controlled Insulator-Metal Transition and Correlated Metallic State in 5d Transition Metal Oxides Sr₊₁IrnO₃₊₁ (n=1, 2, and ∞)

Moon, S. J. ; Jin, H. ; Kim, Kyung Wan ; Choi, W. S. ; Lee, Y. S. ; Yu, J. ; Cao, G. ; Sumi, A. ; Funakubo, H. ; Bernhard, Christian ; Noh, T. W.

In: Physical Review Letters, 2008, vol. 101, no. 22, p. 226402

We investigated the electronic structures of the 5d Ruddlesden-Popper series Sr₊₁IrnO₃₊₁ (n=1, 2, and ∞) using optical spectroscopy and first-principles calculations. As 5d orbitals are spatially more extended than 3d or 4d orbitals, it has been widely accepted that correlation effects are minimal in 5d compounds. However, we...