Low-Temperature Magnetoresistance Effect in the Hydrothermally Synthesized La0.98Ca0.02MnO3-δ/γ-Mn2O3 Granular System |
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Authors: | WANG Jin-hui LIU Gong-Qiang ZHU Hao GU Ben-Xi GU Kun-ming DU You-wei |
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Abstract: | The low-temperature magnetoresistance (LTMR) in hydrothermally synthesized La0.98Ca0.02MnO3-δ/γ-Mn2O3 granular system was investigated. As-prepared powders are amorphous except for a small amount of crystalline phase LaCO3OH. After sintered at 1 073 K or above, La0.98Ca0.02MnO3-δ perovskite and secondary phase γ-Mn2O3 coexist. A large LTMR of ~65% at 127 K and ~50% at 0 K in the sample with mean grain size of 23 nm was observed. The observation of a large magnetoresistance over a wide temperature interval could be of importance for useful applications. |
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Keywords: | powder processing nanoparticles ceramics magnetotransport |
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