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

doi:10.1143/JPSJ.76.103706

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

^*Corresponding author for this work

School of Creative Science and Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

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 language	English
Article number	103706
Journal	journal of the physical society of japan
Volume	76
Issue number	10
DOIs	https://doi.org/10.1143/JPSJ.76.103706
Publication status	Published - 2007 Oct

Keywords

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

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.76.103706

Cite this

@article{56c66b19858543488d69da5879d21f02,

title = "Diffuse phase transition and anisotropic evolution of nanodomains in Nd 0.2Sr 0.8MnO 3 ",

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.",

keywords = "Diffuse phase transition, Manganites, Orbital order, Synchrotron x-ray diffraction, Transmission electron microscopy",

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

year = "2007",

month = oct,

doi = "10.1143/JPSJ.76.103706",

language = "English",

volume = "76",

journal = "journal of the physical society of japan",

issn = "0031-9015",

publisher = "Physical Society of Japan",

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T1 - Diffuse phase transition and anisotropic evolution of nanodomains in Nd 0.2Sr 0.8MnO 3

AU - Nagao, Masahiro

AU - Asaka, Toru

AU - Nagai, Takuro

AU - Akahoshi, Daisuke

AU - Hatakeyama, Ryota

AU - Yokosawa, Tadahiro

AU - Tanaka, Masahiko

AU - Yoshikawa, Hideki

AU - Yamazaki, Atsushi

AU - Kimoto, Koji

AU - Kuwahara, Hideki

AU - Matsui, Yoshio

PY - 2007/10

Y1 - 2007/10

N2 - 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.

AB - 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.

KW - Diffuse phase transition

KW - Manganites

KW - Orbital order

KW - Synchrotron x-ray diffraction

KW - Transmission electron microscopy

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