Effect of Co doping on the magnetotransport properties of La 0.45Sr0.55MnO3 perovskite

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作者：
Ying, Y. [1 ]
Dai, N.V. [1 ]
Eom, T.W. [1 ]
Lee, Y.P. [1 ]
机构：
[1] Department of Physics and Q-Psi, Hanyang University, Seoul 133-791, Korea, Republic of
来源：
Journal of Applied Physics | 2009年 / 105卷 / 09期
关键词：
We investigated the magnetotransport properties of polycrystalline La 0.45Sr0.55Mn1-x Cox O3 (0x0.15). Ferromagnetism is enhanced with the doping of Co ions in La0.45Sr 0.55MnO3; but the antiferromagnetism is nearly destroyed in the low-temperature region. The Mn3+ - Mn4+ double-exchange (DE) and Co2+ - Mn4+ ferromagnetic (FM) superexchange interactions are mainly responsible for the magnetic properties of the doped system. With increased Co doping; the insulating properties and the magnetoresistance (MR) effect are simultaneously enhanced. This indicates that the Co doping strengthens both the Mn3+ - Mn4+ DE and Co2+ - Mn4+ FM superexchange interactions. The Co doping increases the disorder in the system; causing the MR effect to increase with decreasing temperature. © 2009 American Institute of Physics;
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