| 钙钛矿La0.8Ca0.2MnO3多晶样品的制备及低温磁学特性 |
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| 引用本文： | 姜炳植,S.G.Min,S.C.Yu,K.W.Lee.钙钛矿La0.8Ca0.2MnO3多晶样品的制备及低温磁学特性[J].低温物理学报,2012(4):302-305. |
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| 作者姓名： | 姜炳植 S.G.Min S.C.Yu K.W.Lee |
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| 作者单位： | 延边大学理学院物理系;Advanced Materials Research Institute,University of New Orleans;Department of Physics,Chungbuk National University;Korea Research Institute of Standard and Science |
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| 摘 要： | 我们利用固相反应法制备了粉末状La0.8Ca0.2MnO3样品,其空间群为pnma,样品中存在超顺磁性粒子,其截止态和超顺磁态的转变温度为185K,从dσ/dT的负峰得到铁磁-顺磁相变居里温度为210K,在顺磁领域线性拟合而得到顺磁居里温度为216.4K,分子式有效磁矩为6.25μB,低温领域磁化曲线服从布洛赫T32定律,其自旋波劲度系数为49.2meV2.
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| 关 键 词： | 钙钛矿锰氧化物 居里温度 自旋波劲度系数 |
PREPARATION OF PEROVSKITE La0.8Ca0.2MnO3 POLYCRYSTALLINE SAMPLE AND LAW TEMPERATURE MAGNETIC PROPERTIES |
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| Institution: | JIANG Bing-zhi1 S.G.Min2 S.C.Yu3 K.W.Lee4 1 Department of Physics,Yanbian University,Yanji,Jilin 133002; 2 Advanced Materials Research Institute,University of New Orleans,New Orleans 70148,USA; 3 Department of Physics,Chungbuk National University,Chungju 361-763,Republic of Korea; 4 Korea Research Institute of Standard and Science,Yuseong,Daejeon 305-340,Republic of Korea |
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| Abstract: | The La0.8Ca0.2MnO3 powder specimen prepared by solid state reaction method,which has pnma space group.Superparamagnetic particles were found in the specimen,the transition temperature TB from blocking state to superparamagnetic state is 185K and ferromagnetic-paramagnetic phase transition Curie temperature,TC,is 210K obtained from negative peak temperature of dσ dT.The paramagnetic Curie temperature 216.4K was given by linear fitting in paramagnetic regime.The molecular effective magnetic moment is 6.25μB and at the low temperature range the magnetization curve is observed to obey the Bloch law,spin wave stiffness constant were obtained to be 49.2 meV2. |
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| Keywords: | Perovskite manganite Curie temperature Spin wave stiffness constant |
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