Diffuse phase transition and anisotropic evolution of nanodomains in Nd 0.2Sr 0.8MnO 3

Masahiro Nagao, Toru Asaka, Takuro Nagai, Daisuke Akahoshi, Ryota Hatakeyama, Tadahiro Yokosawa, Masahiko Tanaka, Hideki Yoshikawa, Atsushi Yamazaki, Koji Kimoto, Hideki Kuwahara, Yoshio Matsui

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    Abstract

    We investigated the crystal structures of single-crystal Nd 0.2Sr 0.8MnO 3 by means of synchrotron x-ray diffraction measurement and transmission electron microscopy. We observed the coexistence of distinct crystal-structural phases, i.e., tetragonal (orbital ordered) and cubic (orbital disordered) phases, over a significantly wide range of temperatures. The ratio of these phases varied continuously with temperature. These indicate that the crystal exhibits a diffuse phase transition of the 3z 2 - r 2-type orbital ordering. Moreover, we observed the anisotropic evolution of the orbital-ordered nanodomains in the cubic phase. This specific nature of the phase transition probably originates from the competition between the orbital order and disorder.

    Original languageEnglish
    Article number103706
    JournalJournal of the Physical Society of Japan
    Volume76
    Issue number10
    DOIs
    Publication statusPublished - 2007 Oct

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    Keywords

    • Diffuse phase transition
    • Manganites
    • Orbital order
    • Synchrotron x-ray diffraction
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Nagao, M., Asaka, T., Nagai, T., Akahoshi, D., Hatakeyama, R., Yokosawa, T., Tanaka, M., Yoshikawa, H., Yamazaki, A., Kimoto, K., Kuwahara, H., & Matsui, Y. (2007). Diffuse phase transition and anisotropic evolution of nanodomains in Nd 0.2Sr 0.8MnO 3 Journal of the Physical Society of Japan, 76(10), [103706]. https://doi.org/10.1143/JPSJ.76.103706