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

doi:10.4028/www.scientific.net/MSF.783-786.2065

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Role of the Tilting of Oxygen Octahedra in the...

Role of the Tilting of Oxygen Octahedra in the Stabilization of the Orbital-Modulated State in the Layered Perovskite Manganite Ca₂_-_xNd_xMnO₄

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.

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Materials Science Forum (Volumes 783-786)

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2065-2070

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https://doi.org/10.4028/www.scientific.net/MSF.783-786.2065

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Online since:

May 2014

Authors:

Yasuhide Inoue*, Masazumi Arao, Ippei Tanaka, Yasumasa Koyama

Keywords:

Layered Perovskite Ca_2-xNd_xMnO₄, Orbital-Modulated State, Tilting Displacement of Oxygen Octahedra, Transmission Electron Microscopy (TEM)

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