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钙钛矿型稀土锰氧化物La2/3Ca1/3MnO3中Mn位的Ti替代效应
  • ISSN号：1000-3290
  • 期刊名称：《物理学报》
  • 时间：0
  • 分类：TM27[电气工程—电工理论与新技术;一般工业技术—材料科学与工程]
  • 作者机构：[1]中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室!北京100080, [2]中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室!北京100080中国科学技术大学物理系, [3]合肥230026, [4]中国科学院物理研究所与凝
  • 相关基金：国家自然科学基金!（ 批准号：59702011 和59525101）;国家重点基础研究发展规划资助!（ 批准号：G19980613?
作者： 李润伟[1], 王志宏[2], 陈新, 沈保根[4]
关键词： 稀土锰氧化物, 钙钛矿型, 双交换作用, 磁电阻, 居里温度, 超交换作用, 输运性质, 铁磁性, 热磁曲线, 替代效应
中文摘要：

研究了钙钛矿型锰氧化物Ｌａ２／３Ｃａ１／３ Ｍｎ１ － ｘＴｉｘＯ３（０ ≤ｘ ≤０－３） 的结构、磁性和输运性质．发现Ｔｉ 替代Ｍｎ 强烈地抑制了Ｌａ２／３Ｃａ１／３ ＭｎＯ３ 的铁磁性和金属电导，并很大地提高了磁电阻值．在低掺杂情况下（ ｘ ≤０－０４） ，１ ％ 的Ｍｎ 被Ｔｉ 替代，居里温度ＴＣ 和金属绝缘体转变温度Ｔｐ 分别平均下降了３１ 和２６－５ Ｋ．当ｘ ＝ ０－０６ 时，铁磁态过渡为团簇玻璃态，并在ｘ ＝０－２０ 时完全变为自旋玻璃态．指出由于Ｔｉ 的掺入而引起的磁稀释作用以及局域晶格畸变是产生上述结果的主要原因．

同期刊论文项目
混合价氧化物的微结构,磁性和磁输运性质的研究
期刊论文 8
磁性与磁光材料(软磁,硬磁,记录用磁性合金,磁致伸缩合金)
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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