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Applied Physics Letters / Volume 96 / Issue 18 / ELECTRONIC TRANSPORT AND SEMICONDUCTORS

Appl. Phys. Lett. 96, 182103 (2010); http://dx.doi.org/10.1063/1.3374449 (3 pages)

Epitaxially stabilized iridium spinel oxide without cations in the tetrahedral site

Hiromichi Kuriyama1,2, Jobu Matsuno2, Seiji Niitaka2, Masaya Uchida2, Daisuke Hashizume2, Aiko Nakao2, Kunihisa Sugimoto3, Hiroyuki Ohsumi4, Masaki Takata4, and Hidenori Takagi1,2

1Department of Advanced Materials, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
2Advanced Science Institute, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
3Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
4RIKEN, SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan

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(Received 1 January 2010; accepted 9 March 2010; published online 4 May 2010)

Single-crystalline thin film of an iridium dioxide polymorph Ir2O4 has been fabricated by the pulsed laser deposition of LixIr2O4 precursor and the subsequent Li-deintercalation using soft chemistry. Ir2O4 crystallizes in a spinel (AB2O4) without A cations in the tetrahedral site, which is isostructural to λ-MnO2. Ir ions form a pyrochlore sublattice, which is known to give rise to a strong geometrical frustration. This Ir spinel was found to be a narrow gap insulator, in remarkable contrast to the metallic ground state of rutile-type IrO2. We argue that an interplay of a strong spin-orbit coupling and a Coulomb repulsion gives rise to an insulating ground state as in a layered perovskite Sr2IrO4.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

ground states, insulating thin films, iridium compounds, pulsed laser deposition, spin-orbit interactions

PACS

  • 68.55.aj

    Insulators

  • 81.15.Fg

    Pulsed laser ablation deposition

  • 71.70.Ej

    Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3374449

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    B. J. Kim, H. Jin, S. J. Moon, J. -Y. Kim, B. -G. Park, C. S. Leem, J. Yu, T. W. Noh, C. Kim, S. -J. Oh, J. -H. Park, V. Durairaj, G. Cao, and E. Rotenberg, Phys. Rev. Lett. 101, 076402 (2008).

    S. J. Moon, H. Jin, K. W. Kim, W. S. Choi, Y. S. Lee, J. Yu, G. Cao, A. Sumi, H. Funakubo, C. Bernhard, and T. W. Noh, Phys. Rev. Lett. 101, 226402 (2008).

    H. -M. Guo and M. Franz, Phys. Rev. Lett. 103, 206805 (2009).

    M. Dekkers, G. Rijnders, and D. H. A. Blank, Appl. Phys. Lett. 90, 021903 (2007)APPLAB000090000002021903000001.


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