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Pr0．7Ca0．3MnO3陶瓷晶界势垒的交流特性
  • ISSN号：1000-3290
  • 期刊名称：《物理学报》
  • 时间：0
  • 分类：O471.5[理学—半导体物理;理学—物理]
  • 作者机构：[1]湖北大学物理学与电子技术学院,武汉430062, [2]Department of Micro and Nano Systems Technology, Vestfold University College-HiVe, Horten 3184, Norway
  • 相关基金：国家自然科学基金（批准号：11074067,11174073）资助的课题
作者： 石大为[1], 吴美玲[1], 杨昌平[1], 任春林[1], 肖海波[1], 王开鹰
关键词： 钙钛矿结构锰氧化物, 庞磁电阻(CMR), 肖特基势垒, 空间电荷层, perovskite manganite oxide, colossal magnetoresistance （CMR）, Schottky barrier, space charge region
中文摘要：

采用固相烧结方法制备了Prl-x，CaxMnO3（X=0．3）钙态矿结构锰氧化物陶瓷样品，对其在磁场和电场下的直、交流输运性质做了系统研究．通过测量加磁场和零场下的I-V曲线，得到其居里温度为150K，与VSM测试结果一致．通过测量加磁场与零场下交流的阻抗频谱，发现加磁场后样品的晶界电阻明显减小，而晶粒电阻几乎保持不变，表明Pr1-x，CaxMnO3陶瓷多晶样品的CMR效应源于样品的晶界．为确定晶界处的势垒高度，测量了样品在不同频率下的阻抗温谱，根据Arrhenius定律拟合得出势垒高度为117meV,与用直流R-T数据拟合得出的激活能一致．

英文摘要：

Ceramic Prl-xCaxMnO3 （x = 0.3） samples are prepared by solid-state reaction and measured using direct current （DC） and altemat- ing current （AC） methods in different magnetic and electrical fields. A Curie temperature of 150 K is determined by I-V measurements in field for Pr0.7Ca0.3MnO3, which is consistent with that from vibrating sample magnetometer （VSM）. The AC measurement shows that the grain boundary resistance reduces with magnetic field increasing, while the grain almost keeps unchanged, and it indicates that the colossal magnetoresistance （CMR） effect in low field mainly comes from the grain boundary for the Pr0.7Ca0.3MnO3 ceramic. The barrier height of grain boundary is 117 meV for the Pr0.7Ca0.3MnO3 ceramic, obtained by fitting the temperature spectrum of impedance, and it is well coincident with that from fitting the R-T data. A ＂trap state＂ model is proposed to explain all the measured data.

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期刊信息
  • 《物理学报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国物理学会 中国科学院物理研究所
  • 主编：欧阳钟灿
  • 地址：北京603信箱(中国科学院物理研究所)
  • 邮编：100190
  • 邮箱：apsoffice@iphy.ac.cn
  • 电话：010-82649026
  • 国际标准刊号：ISSN：1000-3290
  • 国内统一刊号：ISSN：11-1958/O4
  • 邮发代号:2-425
  • 获奖情况:
  • 1999年首届国家期刊奖,2000年中科院优秀期刊特等奖,2001年科技期刊最高方阵队双高期刊居中国期刊第12位
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  • 被引量:49876