Role of the tilting of oxygen octahedra in the stabilization of the orbital-modulated state in the layered perovskite manganite Ca2-xNdxMnO4

Yasuhide Inoue; Masazumi Arao; Ippei Tanaka; Yasumasa Koyama

Role of the tilting of oxygen octahedra in the stabilization of the orbital-modulated state in the layered perovskite manganite Ca_2-xNd_xMnO₄

Yasuhide Inoue, Masazumi Arao, Ippei Tanaka, Yasumasa Koyama

School of Fundamental Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

There exists the orbital-modulated (OM) state in the layered manganite Ca_2-xNd_xMnO₄ (CNMO) with 0.20 ≤ x ≤ 0.50. To understand the effect of the tilting of MnO₆ octahedra to the stability of the OM state, the crystallographic features of CNMO samples prepared by a solid-state reaction have been investigated mainly by transmission electron microscopy. For 0.30 ≤ x ≤ 0.50, it was found that the (LTO → Pccn/LTT) structural transition occurred on cooling from room temperature, where the LTO and Pccn/LTT structures are, respectively, characterized by tilting displacements of oxygen octahedra about one and two of the <110> directions. The notable feature of the (LTO → Pccn/LTT) transition is that its progress strongly suppresses the growth of the OM state for 0.30 ≤ x ≤ 0.45. As a result of the suppression, the OM state exhibits a re-entrant behavior for its appearance. This is an indication that the Pccn/LTT tilting is not favorable for the stabilization of the OM state.

Original language	English
Title of host publication	THERMEC 2013
Editors	B. Mishra, Mihail. Ionescu, T. Chandra
Publisher	Trans Tech Publications Ltd
Pages	2065-2070
Number of pages	6
ISBN (Print)	9783038350736
Publication status	Published - 2014
Event	8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013 - Las Vegas, NV, United States Duration: 2013 Dec 2 → 2013 Dec 6

Publication series

Name	Materials Science Forum
Volume	783-786
ISSN (Print)	0255-5476
ISSN (Electronic)	1662-9752

Conference

Conference	8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013
Country/Territory	United States
City	Las Vegas, NV
Period	13/12/2 → 13/12/6

Keywords

Orbital-modulated state
Tilting displacement of oxygen octahedra
Transmission electron microscopy

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

Role of the tilting of oxygen octahedra in the stabilization of the orbital-modulated state in the layered perovskite manganite Ca_2-xNd_xMnO₄. / Inoue, Yasuhide; Arao, Masazumi; Tanaka, Ippei et al.
THERMEC 2013. ed. / B. Mishra; Mihail. Ionescu; T. Chandra. Trans Tech Publications Ltd, 2014. p. 2065-2070 (Materials Science Forum; Vol. 783-786).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Inoue, Y, Arao, M, Tanaka, I & Koyama, Y 2014, Role of the tilting of oxygen octahedra in the stabilization of the orbital-modulated state in the layered perovskite manganite Ca_2-xNd_xMnO₄. in B Mishra, M Ionescu & T Chandra (eds), THERMEC 2013. Materials Science Forum, vol. 783-786, Trans Tech Publications Ltd, pp. 2065-2070, 8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013, Las Vegas, NV, United States, 13/12/2.

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abstract = "There exists the orbital-modulated (OM) state in the layered manganite Ca2-xNdxMnO4 (CNMO) with 0.20 ≤ x ≤ 0.50. To understand the effect of the tilting of MnO6 octahedra to the stability of the OM state, the crystallographic features of CNMO samples prepared by a solid-state reaction have been investigated mainly by transmission electron microscopy. For 0.30 ≤ x ≤ 0.50, it was found that the (LTO → Pccn/LTT) structural transition occurred on cooling from room temperature, where the LTO and Pccn/LTT structures are, respectively, characterized by tilting displacements of oxygen octahedra about one and two of the <110> directions. The notable feature of the (LTO → Pccn/LTT) transition is that its progress strongly suppresses the growth of the OM state for 0.30 ≤ x ≤ 0.45. As a result of the suppression, the OM state exhibits a re-entrant behavior for its appearance. This is an indication that the Pccn/LTT tilting is not favorable for the stabilization of the OM state.",

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N2 - There exists the orbital-modulated (OM) state in the layered manganite Ca2-xNdxMnO4 (CNMO) with 0.20 ≤ x ≤ 0.50. To understand the effect of the tilting of MnO6 octahedra to the stability of the OM state, the crystallographic features of CNMO samples prepared by a solid-state reaction have been investigated mainly by transmission electron microscopy. For 0.30 ≤ x ≤ 0.50, it was found that the (LTO → Pccn/LTT) structural transition occurred on cooling from room temperature, where the LTO and Pccn/LTT structures are, respectively, characterized by tilting displacements of oxygen octahedra about one and two of the <110> directions. The notable feature of the (LTO → Pccn/LTT) transition is that its progress strongly suppresses the growth of the OM state for 0.30 ≤ x ≤ 0.45. As a result of the suppression, the OM state exhibits a re-entrant behavior for its appearance. This is an indication that the Pccn/LTT tilting is not favorable for the stabilization of the OM state.

AB - There exists the orbital-modulated (OM) state in the layered manganite Ca2-xNdxMnO4 (CNMO) with 0.20 ≤ x ≤ 0.50. To understand the effect of the tilting of MnO6 octahedra to the stability of the OM state, the crystallographic features of CNMO samples prepared by a solid-state reaction have been investigated mainly by transmission electron microscopy. For 0.30 ≤ x ≤ 0.50, it was found that the (LTO → Pccn/LTT) structural transition occurred on cooling from room temperature, where the LTO and Pccn/LTT structures are, respectively, characterized by tilting displacements of oxygen octahedra about one and two of the <110> directions. The notable feature of the (LTO → Pccn/LTT) transition is that its progress strongly suppresses the growth of the OM state for 0.30 ≤ x ≤ 0.45. As a result of the suppression, the OM state exhibits a re-entrant behavior for its appearance. This is an indication that the Pccn/LTT tilting is not favorable for the stabilization of the OM state.

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