Magnetic and magnetoresistance in half-doped manganite La0.5Ca0.5MnO3 and La0.5Ca0.4Ag0.1MnO3

被引：31

作者：

Smari, M. ^{[1
]}

Hamouda, R. ^{[1
]}

Walha, I. ^{[1
]}

Dhahri, E. ^{[1
]}

Mompean, F. J. ^{[2
]}

Garcia-Hernandez, Mar ^{[2
]}

机构：

[1] Univ Sfax, Fac Sci, Lab Phys Appl, Sfax 3000, Tunisia

[2] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 644卷

关键词：

Antiferromagnetic transition; Magnetic materials; Electrical resistivity; Magnetoresistive effect; PHASE-SEPARATION; COLOSSAL MAGNETORESISTANCE; FERROMAGNETIC PHASE; FIELD; MAGNETOTRANSPORT; TEMPERATURE; TRANSITION; BEHAVIOR;

D O I：

10.1016/j.jallcom.2015.05.026

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：

La0.5Ca0.5MnO3 and La0.5Ca0.4Ag0.1MnO3 ceramics have been prepared by sal-gel methods and its magnetic properties, and electronic transport properties have been experimentally investigated. X-ray diffraction data reveal that all samples crystallize in a orthorhombic structure with Pnma space group. Magnetic measurements of La0.5Ca0.5MnO3 show multiple magnetic transitions, a paramagnetic to ferromagnetic and a ferromagnetic to charge-ordered antiferromagnetic. Two metal-semiconductor transitions (T rho(1) and T rho(2)) are observed in the electrical resistivity. The electrical resistivity decreases when an external magnetic field is applied rendering a magnetoresistive effect of the order of 75% at the charge-ordered temperature. All the samples clearly reveal the unusual low temperature resistivity minimum, presumably due to the combined effect of weak localization, electron-electron and electron-phonon scattering. The present results are discussed and possible explanations were given based on the related theory and previous reported results. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：632 / 637

页数：6

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[1] Comment on "Magnetic and magnetoresistance in half-doped manganite La0.5Ca0.5MnO3 and La0.5Ca0.4Ag0.1MnO3"
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