Monovalent effects on structural, magnetic and magnetoresistance properties in doped manganite oxides

被引：42

作者：

Abdelmoula, N

Dhahri, E

Fourati, N

Reversat, L

机构：

[1] Fac Sci Sfax, Appl Phys Lab, Sfax 3018, Tunisia

[2] Univ Paris 11, Inst Elect Fondamentale, F-91405 Orsay, France

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2004年 / 365卷 / 1-2期

关键词：

manganites; perovskite; monovalent effects;

D O I：

10.1016/S0925-8388(03)00639-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Structural, magnetic and magneto-transport properties of La0.7Sr0.3-xNaxMnO3 (0less than or equal toxless than or equal to0.2) manganites have been investigated. Our samples, elaborated by the classical ceramic method, crystallized in the rhombohedrally distorted perovskite structure with R (3) over barc space group. Magnetic measurements showed that our compounds exhibit a paramagnetic-ferromagnetic transition with decreasing temperature. The Curie temperature decreases with increasing Na content. Electrical investigations showed that all our samples exhibit a semi-conducting behavior at high temperature and a metallic-like one at low temperature. A large magnetoresistance of 29% has been observed at room temperature and in 5T in the bulk of La0.7Sr0.1Na0.2MnO3 compound. (C) 2003 Elsevier B.V. All rights reserved.

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页码：25 / 30

页数：6

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