Orbital and Charge Ordering in La1-xSr1+xMnO4(0.4〓x〓0.5)

  • Wakabayashi Yusuke
    Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223-8522 Photon Factory, Institute of Materials Structure Science, High-Energy Accelerator Research Organization, Tsukuba 305-0801
  • Murakami Youichi
    Photon Factory, Institute of Materials Structure Science, High-Energy Accelerator Research Organization, Tsukuba 305-0801 Core Research for Evolutional Science and Technology (CREST), Tsukuba 305-0047
  • Moritomo Yutaka
    Center for Integrated Research in Science and Engineering (CIRSE), Nagoya University, Nagoya 464-8601
  • Koyama Ichiro
    Photon Factory, Institute of Materials Structure Science, High-Energy Accelerator Research Organization, Tsukuba 305-0801
  • Nakao Hironori
    Photon Factory, Institute of Materials Structure Science, High-Energy Accelerator Research Organization, Tsukuba 305-0801
  • Kiyama Takashi
    Photon Factory, Institute of Materials Structure Science, High-Energy Accelerator Research Organization, Tsukuba 305-0801
  • Kimura Tsuyoshi
    Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046
  • Tokura Yoshinori
    Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046 Department of Applied Physics, University of Tokyo, Tokyo 113-8656
  • Wakabayashi Nobuyoshi
    Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223-8522

書誌事項

タイトル別名
  • Orbital and Charge Ordering in La1-xSr1+xMnO4(0.4.LEQ.x.LEQ.0.5).
  • Orbital and Charge Ordering in La1 xSr1 xMnO4 0 4 x 0 5
  • Orbital and Charge Ordering in La<sub>1-<i>x</i></sub>Sr<sub>1+<i>x</i></sub>MnO<sub>4</sub>(0.4≤<i>x</i>≤0.5)

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抄録

Hole concentration dependence of charge order (CO) and orbital order (OO) in layered perovskite compounds La1-xSr1+xMnO4 has been studied by means of the resonant X-ray scattering technique. Both CO and OO are observed below 210 K in the compounds having the hole concentration x between 0.5 and 0.48, but neither is observed for x≤0.46. The transition temperatures are nearly independent of x between 0.5 and 0.48. Correlation lengths ξ's for both orders obtained from analyses of superlattice peak profiles are finite at any temperature. Moreover, in contrast to the cubic perovskite, ξ for OO is larger than that for CO. ξ for OO is as short as that for CO at the critical concentration of x=0.48. These results suggest that OO is prerequisite to the forming of CO in this system.

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