Charge ordered state in the impurity-doped manganites

Impurity effect on the charge and orbital ordered (CO/OO) state in doped manganites has been studied by the transmission electron microscopy (TEM), in addition to the electric and magnetic measurements. In the Cr-doped manganites (Nd0.5Ca0.5Mn1-yCryO3), the CO/OO state characterized by the incommens...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2002-05, Vol.71 (5), p.1280-1283
Main Authors: MORI, S, SHOJI, R, YAMAMOTO, N, MACHIDA, A, MORITOMO, Y, KATSUFUJI, T
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Metal-insulator transitions and other electronic transitions
Physics
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Summary:Impurity effect on the charge and orbital ordered (CO/OO) state in doped manganites has been studied by the transmission electron microscopy (TEM), in addition to the electric and magnetic measurements. In the Cr-doped manganites (Nd0.5Ca0.5Mn1-yCryO3), the CO/OO state characterized by the incommensurate wave vector is still realized as the microdomains with the size of 10-30 nm even at lower temperature of 20 K. On the other hand, the Sc-doped manganites (Nd0.5Ca0.5Mn1-yScyO3) clearly show an incommensurate to commensurate structural phase transition accompanying the formation of the long-ranged CO/OO state around 60 K. From our experimental findings, it is suggested that the substituted Cr3+ and Sc3+ ions serve as the spin impurity and hole vacancy, respectively.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.71.1280