| 基于La_(1.4)Ca_(1.6)Mn_2O_7结构、电输运及磁性研究(英文) |
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| 引用本文： | 陈宣,李兵,田发亮,王晓平,朱弘. 基于La_(1.4)Ca_(1.6)Mn_2O_7结构、电输运及磁性研究(英文)[J]. 低温物理学报, 2009, 31(2) |
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| 作者姓名： | 陈宣 李兵 田发亮 王晓平 朱弘 |
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| 作者单位： | 中国科学技术大学物理系,合肥,230026 |
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| 基金项目： | 国家重点基础研究发展规划(973计划)，国家自然科学基金 |
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| 摘 要： | 我们制备了名义成分是La1.4 Ca1.6 Mn2 O7的多晶样品,并且研究了它的结构、磁性和电性.利用Rietveld方法对X射线衍射数据进行精修的结果表明,该La1.4 Ca1.6 Mn2 O7是由钙钛矿锰氧化物La0.66 Ca0.34 MnO3和氧化钙CaO组成的复相混合物.其中,La0.66 Ca0.34 MnO3占相成分的大部分,而CaO占小部分.我们对比了该名义组分样品La1.4 Ca1.6 Mn2 O7和La0.7 Ca0.3 MnO3的铁磁居里转变温度和绝缘体-金属转变温度,结果表明该La1.4 Ca1.6 Mn2 O7的磁输运性质是由其中的钙钛矿相成分决定的.所有的这些结果表明,名义组分样品La1.4 Ca1.6 Mn2 O7实际上并没有形成所谓的Sr3Ti2O7型的双层结构,而实际形成的是以钙钛矿结构作为主相的复相混合物.
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| 关 键 词： | 双层钙钛矿锰氧化物 磁输运 Rietveld精修 X射线衍射 |
STRUCTURAL,ELECTRICAL AND MAGNETIC PROPERTIES OF La_(1.4)Ca_(1.6)Mn_2O_7:A COMPARISON WITH La_(0.7)Ca_(0.3)MnO_3 |
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| CHEN Xuan LI Bing TIAN Fa-liang WANG Xiao-ping ZHU Hong. STRUCTURAL,ELECTRICAL AND MAGNETIC PROPERTIES OF La_(1.4)Ca_(1.6)Mn_2O_7:A COMPARISON WITH La_(0.7)Ca_(0.3)MnO_3[J]. Chinese Journal of Low Temperature Physics, 2009, 31(2) |
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| Authors: | CHEN Xuan LI Bing TIAN Fa-liang WANG Xiao-ping ZHU Hong |
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| Affiliation: | CHEN Xuan LI Bing TIAN Fa-liang WANG Xiao-ping ZHU Hong Department of Physics,University of Science , Technology of China,Hefei 230026 |
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| Abstract: | Polycrystalline sample with nominal composition La1.4Ca1.6Mn2O7 has been prepared and characterized by X-ray diffraction (XRD),as well as magnetic and electrical measurements. Rietveld refinement of the XRD pattern indicates that the La1.4Ca1.6Mn2O7 sample is a multiphase mixture of doped perovskite manganite La0.66Ca0.34MnO3 as the majority phase and calcium oxide CaO as the minority phase. Both the Curie temperature and the insulator-metal transition temperature of the La1.4Ca1.6Mn2O7 sample are in consis... |
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| Keywords: | Layered perovskite manganite magnetotransport Rietveld refinement X-ray diffraction |
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