Enhanced ferromagnetic transition and magnetoresistance in granular Ag-added La0.7Ca0.3MnO3 |
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| Authors: | Yun-Hui Huang Ke-Feng Huang Lian-Long He Chun-Sheng Liao |
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| Institution: | a State Key Lab of Rare Earth Materials Chemistry and Applications and PKU-HKU Joint Lab in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, Chinab Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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| Abstract: | Granular Ag-added La0.7Ca0.3MnO3 (LCMO) samples were prepared by a sol-gel chemical route. Significant enhancements in Curie temperature (TC), metal−insulator transition (Tp) and magnetoresistance (MR) effects near room temperature are observed in as-obtained samples. 10 wt% addition of Ag in LCMO causes TC shift from 272 to 290 K, Tp boost up for more than 100 K and resistivity decrease by more than 3 orders of magnitude. X-ray diffraction patterns, thermal analysis and energy dispersive analysis of X-rays evidently show the existence of metal silver in LCMO matrices. High-resolution electron microscopy illustrates a well crystallization for LCMO grains in existence of Ag. It is argued that improved grain boundary effect and better crystallization caused by Ag addition are responsible for the enhancements. |
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| Keywords: | Ag-added La0 7Ca0 3MnO3 Synthesis Magnetic behavior Transport |
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