Charge-order breaking and ferromagnetism in La0.4Ca0.6MnO3 nanoparticles

被引：110
作者：
Lu, C. L.
Dong, S.
Wang, K. F.
Gao, F.
Li, P. L.
Lv, L. Y.
Liu, J.-M. [1 ]
机构：
[1] Nanjing Univ, Nanjing Natl Lab Microstruct, Nanjing 210093, Peoples R China
[2] Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 03期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1063/1.2753749
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
La0.4Ca0.6MnO3 nanoparticles of grain size as small as similar to 20 nm are prepared and their magnetic behaviors are investigated in order to understand the size effect of the charge ordering in manganites. The highly stable charge-ordered state can be significantly suppressed upon reduction of the grain size down to nanometer scale, while the ferromagnetism is enhanced. The magnetic phase separation due to the competition between ferromagnetic state and charge-ordered state as well as the surface spin disordering is responsible for the spin-glass-like state at low temperature. (C) 2007 American Institute of Physics.
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