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.

doi:10.1103/PhysRevLett.101.226402

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Journal article

Dimensionality-Controlled Insulator-Metal Transition and Correlated Metallic State in 5d Transition Metal Oxides Sr₊₁Ir_nO₃₊₁ (n=1, 2, and ∞)

Moon, S. J. ReCOE & FPRD, Department of Physics and Astronomy, Seoul National University, Korea
Jin, H. CSCMR & FPRD, Department of Physics and Astronomy, Seoul National University, Korea
Kim, Kyung Wan Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
Choi, W. S. ReCOE & FPRD, Department of Physics and Astronomy, Seoul National University, Korea
Lee, Y. S. Department of Physics, Soongsil University, Seoul Korea
Yu, J. CSCMR & FPRD, Department of Physics and Astronomy, Seoul National University, Korea
Cao, G. Department of Physics and Astronomy, University of Kentucky, Lexington, USA
Sumi, A. Department of Innovative and Engineered Materials, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Japan
Funakubo, H. Department of Innovative and Engineered Materials, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Japan
Bernhard, Christian Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
Noh, T. W. ReCOE & FPRD, Department of Physics and Astronomy, Seoul National University, Korea

24.11.2008

Published in:

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

English We investigated the electronic structures of the 5d Ruddlesden-Popper series Sr₊₁Ir_nO₃₊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.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

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