| Low-Temperature Magnetoresistance Effect in the Hydrothermally Synthesized La0. 98Ca0. 02MnO3-δ／γ,Mn2O3 Granular System |
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| 引用本文： | 王锦辉,刘公强,朱浩,顾本喜,谷坤明,都有为.Low-Temperature Magnetoresistance Effect in the Hydrothermally Synthesized La0. 98Ca0. 02MnO3-δ／γ,Mn2O3 Granular System[J].上海交通大学学报(英文版),2005,10(1):91-94. |
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| 作者姓名： | 王锦辉 刘公强 朱浩 顾本喜 谷坤明 都有为 |
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| 作者单位： | [1]Dept.ofPhysics,ShanghaiJiaotongUniv.,Shanghai200030,China [2]NationalLab.ofSolidStateMicrostructures,NanjingUniv.,Nanjing210093 |
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| 摘 要： | 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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| 关 键 词： | 粉末加工 纳米粒子 陶瓷技术 LTMR 磁致电阻 |
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