| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Enhanced Magnetoresistance of (La0.67Ca0.33MnO3) Composites Coated byZn0.95Co0.05O |
| ZHUANG Bin, XU Yan, LAI Heng, HUANG Zhi-Gao, CHEN Shui-Yuan, LIN Ying-Bin, LI Shang-Dong, LAI Fa-Chun |
| Department of Physics, Fujian Normal University, Fuzhou 350007 |
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| Cite this article: |
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ZHUANG Bin, XU Yan, LAI Heng et al 2009 Chin. Phys. Lett. 26 057502 |
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Abstract La0.7Ca0.3MnO3:xZn0.95Co0.05O (x = 0.0, 0.05, 0.1, 0.15 mol) composites are prepared by a sol-gel process. X-ray diffraction and energy diffraction spectroscopy reveal that there is no evidence of a reaction between the La0.7Ca0.3MnO3(LCMO) and Zn0.95Co0.05O (ZCO). Magnetization M, Curie temperature TC and metal-insulator transition temperatures Tp are observed to decrease with increasing ZCO content. Compared with x = 0.0, a great enhancement in the magnetoresistance (MR) is observed at around TC for x = 0.05, 0.10, 0.15. Based on the tunneling MR and percolation models, this great change of MR is well explained.
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| Keywords:
75.47.Gk
75.47.Lx
75.75.+a
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Received: 06 October 2008
Published: 23 April 2009
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