| 双层钙钛矿La1.8Ca1.2Mn2O7磁性相关I-V非线性与电输运性质 |
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| 引用本文： | 邓恒,杨昌平,黄昌,徐玲芳.双层钙钛矿La1.8Ca1.2Mn2O7磁性相关I-V非线性与电输运性质[J].物理学报,2010,59(10):7390-7395. |
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| 作者姓名： | 邓恒 杨昌平 黄昌 徐玲芳 |
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| 作者单位： | 1. 湖北大学物理学与电子技术学院,铁电压电材料与器件湖北省重点实验室,武汉430062
2. 湖北大学物理学与电子技术学院,铁电压电材料与器件湖北省重点实验室,武汉430062;燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004 |
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| 基金项目： | 国家自然科学基金(批准号:10774040,0911120055)和教育部新世纪优秀人才支持计划(批准号:NCET-08-0674)资助的课题. |
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| 摘 要： | 采用传统固相反应法制备了双层钙钛矿结构锰氧化物La1.8Ca1.2Mn2O7陶瓷,并用X射线粉末衍射法,扫描电镜,HL5500PC Hall效应分析仪和综合物性测量系统(PPMS)对其磁、电性质进行了表征.结果表明:经过两次高温烧结可合成具有双层Sr3Ti2O7型四方结构的La1.8Ca1.2Mn2<
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| 关 键 词： | 双层钙钛矿锰氧化物 I-V非线性 晶界磁性势垒 磁电耦合 |
| 收稿时间： | 2009-11-11 |
Magnetically correlated I-V nonlinearity and electrical transport property of the double-layered perovskite La1.8Ca1.2Mn2O7 compound |
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| Deng Heng,Yang Chang-Ping,Huang Chang,Xu Ling-Fang.Magnetically correlated I-V nonlinearity and electrical transport property of the double-layered perovskite La1.8Ca1.2Mn2O7 compound[J].Acta Physica Sinica,2010,59(10):7390-7395. |
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| Authors: | Deng Heng Yang Chang-Ping Huang Chang Xu Ling-Fang |
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| Institution: | The Faculty of Physics and Electronic Technology and Key Laboratory of Ferroelectric and Piezoelectric Materials and Devices of Hubei Province, Hubei University, Wuhan 430062, China;The Faculty of Physics and Electronic Technology and Key Laboratory of Ferroelectric and Piezoelectric Materials and Devices of Hubei Province, Hubei University, Wuhan 430062, China; State Key Laboratory of Metastable Materials Science and Technology, Yan;The Faculty of Physics and Electronic Technology and Key Laboratory of Ferroelectric and Piezoelectric Materials and Devices of Hubei Province, Hubei University, Wuhan 430062, China;The Faculty of Physics and Electronic Technology and Key Laboratory of Ferroelectric and Piezoelectric Materials and Devices of Hubei Province, Hubei University, Wuhan 430062, China |
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| Abstract: | The double-layered perovskite La1.8Ca1.2Mn2O7 ceramic was synthesized by traditional solid-state reaction after heat treatment for two times at high temperature. Its structure, magnetic and electrical properties were characterized by x ray diffraction (XRD), scanning electron microscopy (SEM), HL5500PC and physical properties measurement system (PPMS). It has a double-layered Sr3Ti2O7 tetragonal structure with lattice constants a, b=3.901 (1 =0.1 nm) and c=19.369 , and unit cell volume V=295.21 3. The Curie temperature TC is 177 K. The I-V characteristic shows a nonlinearity increasing with decreasing temperature at low temperatures below the magnetic critical point of TC and the nonlinear coefficient α goes up to a maximum of 68.6 when the temperature goes down to the lowest of 14 K in this experiment. However, the nonlinearity disappears when temperature goes above the magnetic transition point of TC. It indicates that a magnetically correlated Schottky barrier between grain boundaries is responsible for the I-V nonlinearity when temperature is below the Curie temperature. A maximum value of 0.18 eV was obtained for the magnetic Schottky barrier at 14 K after using a back to back pn junction model to describe such a potential barrier between grain boundaries. |
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| Keywords: | double-layered perovskite manganites I-V nonlinearity magnetic Schottky barrier magnetic-electric coupling |
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