2005年12月
Structure, magnetism and transport of the perovskite manganites Ln(0.5)Ca(0.5)MnO(3) (Ln = Ho, Er, Tm, Yb and Lu)
JOURNAL OF SOLID STATE CHEMISTRY
- ,
- ,
- 巻
- 178
- 号
- 12
- 開始ページ
- 3615
- 終了ページ
- 3623
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.jssc.2005.08.033
- 出版者・発行元
- ACADEMIC PRESS INC ELSEVIER SCIENCE
It was found that the manganese perovskite oxides Ln(0.5)Ca(0.5)MnO(3) (Ln = Ho, Er, Tm, Yb and Lu) have an orthorhombic structure (space group Pnma). The Mn-O-Mn angles were calculated to be similar to 148-150 degrees, revealing an existence of a large crystallographic distortion in these oxides. Electrical resistivity measurements indicated both an insulating nature and a small magnetoresistance effect, both of which are owing to narrow bandwidths of the Mn-3d electrons arising from the crystallographic distortion. DC magnetization measurements showed the three characteristic temperatures, which could be assigned to charge-order, antiferromagnetism or Mn moments, and possible glassy states. All of these temperatures were decreased for the heavier Ln ions, which is explained in connection with both a difference of ionic radii of Ln(3+) and Ca2+, and a lowering of electron transfer. The charge-ordering transition was not clearly observed only for Lu0.5Ca0.5MnO3 containing the smallest lanthanide ion, plausibly due to a large randomness of magnetic interactions arising from the ionic radii difference of Lu3+ and Ca2+. In addition, preliminary measurements of AC dielectric response suggested that these manganites belong to a so-called multiferroic system. (C) 2005 Elsevier Inc. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.jssc.2005.08.033
- ISSN : 0022-4596
- Web of Science ID : WOS:000234442100002