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Rotation of orbital stripes and the consequent charge-polarized state in bilayer manganites

Nature Materials volume 5, pages 937941 (2006) | Download Citation

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Abstract

Nanoscale self-organization of electrons is ubiquitously observed in correlated electron systems such as complex oxides of transition metals. The phenomenon of charge ordering (CO) or the formation of charge stripes, as observed for layered-structure cuprates1 and nickelates2, is one such example. Among them, CO in manganites is closely tied to the orbital degree of freedom of 3d electrons, leading to staggered orbital ordering or the formation of orbital stripes in the layered structure3,4. Here, we describe the phenomena of thermally induced rotation of the orbital stripes by 90 for bilayered manganite crystals with half hole doping, that is, a 1:1 ratio of Mn3+/Mn4+. The rotation of orbital stripes and the consequent CO coupled with the underlying lattice distortion were found to produce the charge-polarized state, as also shown by its optical second-harmonic generation activity.

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Acknowledgements

This work was supported in part by Grant-in-Aids for Scientific Research from the MEXT, Japan.

Author information

Author notes

    • Thomas Lottermoser

    Present address: HISKP, University of Bonn, Nussalle 14-16, 53115 Bonn, Germany

    • Yunsang Lee

    Present address: Department of Physics, Soongsil University, Seoul 156-743, Korea

Affiliations

  1. Spin Superstructure Project, ERATO, Japan Science and Technology Agency (JST), Tsukuba, Ibaraki 305-8562, Japan

    • Yusuke Tokunaga
    • , Thomas Lottermoser
    • , Yunsang Lee
    • , Masaya Uchida
    • , Takahisa Arima
    •  & Yoshinori Tokura
  2. Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562, Japan

    • Reiji Kumai
    •  & Yoshinori Tokura
  3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan

    • Takahisa Arima
  4. Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan

    • Yoshinori Tokura
  5. Multiferroics Project, ERATO, Japan Science and Technology Agency (JST), Tsukuba, Ibaraki 305-8562, Japan

    • Yoshinori Tokura

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Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Yusuke Tokunaga.

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DOI

https://doi.org/10.1038/nmat1773

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