Effect of particle size on the giant magnetoresistance of La0.7Ca0.3MnO3
Effect of particle size on the giant magnetoresistance of La0.7Ca0.3MnO3
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DOI：
10.1063/1.116167
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发表时间：
1996-04-15
影响因子：
4
通讯作者：
Rao, CNR
中科院分区：
文献类型：
--
作者：
Mahesh, R;Mahendiran, R;Rao, CNR
研究了不同粒径对La0.7Ca0.3MnO3电子输运和磁性能的影响。样品的铁磁性T-c、低场磁化率和绝缘体-金属转变受粒径影响较大，但T-c附近的最大磁电阻对粒径不敏感。然而，4.2 K时的磁电阻随着晶粒尺寸的减小而增大，这表明晶界对磁电阻有很大的贡献。对不同粒径La0.7Sr0.3MnO3样品的初步测量也证实了上述结论。(C) 1996年美国物理研究所。
Effect of particle size on the electron transport and magnetic properties of La0.7Ca0.3MnO3 has been investigated. While the ferromagnetic T-c, low field magnetic susceptibility, and insulator-metal transition are markedly affected by the particle size, the maximum magnetoresistance exhibited by the samples near T-c is not sensitive to the particle size. However, the magnetoresistance at 4.2 K increases with decrease in particle size, suggesting a substantial contribution by the grain boundaries. Preliminary measurements on La0.7Sr0.3MnO3 samples of different particle sizes also corroborate the above conclusions. (C) 1996 American Institute of Physics.