ElectricalTransportandMagneticPropertiesofLa0.67Ca0.33Mn1-xCrxO3andLa0.67+xCa0.33-xMn1-xCrxO3（0.04≤x≤0.08）

被引：0
作者：
XIAO XunYUAN SongliuYIN ShiyanCHEN LingREN Guangming MIAO JuhongYU Gongqi School of Physics Science and TechnologyYangtze UniversityJingzhou ChinaDepartment of PhysicsHuazhong University of Science and TechnologyWuhan China [1 ,2 ,2 ,2 ,2 ,2 ,2 ,1 ,434023 ,2 ,430074 ]
机构：
来源：
Journal of Wuhan University of Technology(Materials Science Edition) | 2008年 / 04期
关键词：
perovskite manganites; double exchange; metal-insulator transition; colossal magnetoresistance;
D O I：
暂无
中图分类号：
TB302 [工程材料试验];
学科分类号：
0805 ; 080502 ;
摘要：
A comparative study for two different series,La 0.67 Ca 0.33 Mn 1-x Cr x O3 and La 0.67+x Ca 0.33-x Mn 1- x Cr x O 3 ,is performed with x changing from 0.04 to 0.08 through measurements of zero-field resistivity(ρ), magnetoresistance(MR)and ac susceptibility(χ)as functions of temperature(T).For the second group,a single insulator-metal transition was characterized by the resistivity maximum appears inρvs.T curve.For the first group,besides the resistivity peak appearing at higher temperatures,the sample shows evidence for the existence of another peak appearing at lower temperatures.Compared to the first group,the second group shows a significant enhancement in MR effect,while the measurement ofχ-T dependence does not display obvious differences for the two series.Different behaviors observed in the two series are discussed by considering possible exchange interaction between Mn3+ion and Cr3+ion.
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页码：463 / 466
页数：4
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