Structural, magnetic and magnetoresistive properties of La0.7Sr0.3-xNaxMnO3 manganites
Structural, magnetic and magnetoresistive properties of La0.7Sr0.3-xNaxMnO3 manganites
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La0.7Sr0.3-xNaxMnO3 锰酸盐的结构、磁性和磁阻特性
DOI：
10.1088/0953-8984/13/3/307
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
L. Reversat
中科院分区：
文献类型：
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作者：
N. Abdelmoula;A. Cheikh;L. Reversat
研究了碱金属一价取代对La0.7Sr0.3-xNaxMnO 3（0≤x≤0.2）的结构、磁性和电学性能的影响。X-射线衍射分析表明，样品为菱方畸变钙钛矿结构，空间群为Rc。随着温度的升高，所有样品都呈现铁磁-顺磁转变和金属-半导体转变。随着Na含量的增加，居里温度TC从365 K下降到305 K，电阻率转变温度Tρ从340 K下降到270 K。在300 K和10 T的外加磁场下，在La_（0.7）Sr_（0.1）Na_（0.2）MnO_3块体陶瓷样品中观察到约46%的磁电阻比。
We present the monovalent alkali metal substitution effects upon structural, magnetic and electrical properties in La0.7Sr0.3-xNaxMnO3 for 0≤x≤0.2. X-ray diffraction patterns show that our powder samples crystallize in a rhombohedral distorted perovskite structure with Rc space group. All the samples exhibit a ferromagnetic-paramagnetic transition and metallic-semi-conductor one with increasing temperature. The Curie temperature TC decreases from 365 to 305 K; however the resistivity transition temperature Tρ decreases from 340 to 270 K as Na content increases. A magnetoresistance ratio of about 46% at 300 K and in an applied field of 10 T has been observed in the bulk ceramic La0.7Sr0.1Na0.2MnO3 sample.