Structural, transport, and magnetic properties in the Ti-doped manganites LaMn1-xTixO3 (0 ≤ x ≤ 0.2)

被引：29

作者：

Yang, J ^{[1
]}

Ma, YQ ^{[1
]}

Zhang, RL ^{[1
]}

Zhao, BC ^{[1
]}

Ang, R ^{[1
]}

Song, WH ^{[1
]}

Sun, YP ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China

来源：

SOLID STATE COMMUNICATIONS | 2005年 / 136卷 / 05期

关键词：

colossal magnetoresistance; magnetic properties; electronic transport;

D O I：

10.1016/j.ssc.2005.08.005

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The magnetism and transport properties of the samples LaMn1-xTixO3 (0 <= x <= 0.2) were investigated. All samples show a rhombohedral structure (R (3) over barC) at room temperature. The sample with x=0 undergoes the paramagnetic-ferromagnetic (PM-FM) transition accompanied by an insulator-metal (I-M) transition due to the oxygen excess. The doped samples show ferromagnetism and cluster behavior at low temperatures. Though no I-M transition associated with the PM-FM transition appears, the magnetoresistance (MR) effect was observed especially at low temperatures under the applied fields of 0.5 T. Due to the fact that the oxygen content in the Ti-doped samples is nearly stochiometry (3.01) and the Hall resistivity at room temperature is negative, the ferromagnetism in LaMn1-xTixO3 (0.05 <= x <= 0.2) is believed to be consistent with the Mn2+-O-Mn3+ double exchange (DE) mechanism. These results suggest that DE can be obtained by direct Mn-site doping, (C) 2005 Published by Elsevier Ltd.

引用

页码：268 / 272

页数：5

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