Faculté des sciences

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... Plus

Ajouter à la liste personnelle
    Summary
    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 observed a Mott insulator-metal transition with a change of bandwidth as we increased n. In addition, the artificially synthesized perovskite SrIrO₃ showed a very large mass enhancement of about 6, indicating that it was in a correlated metallic state.