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La0.67Ca0.33MnO3薄膜中的各向异性应变与电荷有序
  • ISSN号：1000-3258
  • 期刊名称：《低温物理学报》
  • 时间：0
  • 分类：O482.5[理学—固体物理;理学—物理]
  • 作者机构：[1]合肥微尺度物质科学国家实验室,中国科学技术大学,合肥230026
  • 相关基金：国家自然科学基金（项目编号：10874166 50721061）; 国家重点基础研究发展计划（项目编号：2006CB922005 2009CB929502）资助的课题
作者： 李国民[1], 王凌飞[1], 黄振[1], 吴文彬[1]
关键词： 钙钛矿锰氧化物, 电荷有序, 应变, perovskite manganites, charge ordering, strain
中文摘要：

本文采用脉冲激光沉积法在NdGaO3（001）单晶衬底上制备了一系列的La0.67Ca0.33MnO3薄膜,实验主要研究了薄膜的输运性质.La0.67Ca0.33MnO3块材是铁磁金属基态,而La0.67Ca0.33MnO3/NdGaO3（001）薄膜由于各向异性应变的存在,可以观测到电荷有序绝缘相的出现.薄膜样品表现出明显的两相共存（铁磁金属态和电荷有序绝缘相）,我们可以通过改变薄膜厚度和后退火时间来调制电荷有序绝缘相.在薄膜相共存区域,升降温过程中有显著的热滞现象,可以观测到明显的低场磁阻.结果表明各向异性应变对于锰氧化物薄膜中电荷有序相的形成有重要作用.

英文摘要：

Transport properties of La0.67Ca0.33MnO3 films grown on NdGaO3（001） substrates were systematically studied.The control of charge ordering insulating（COI） phase in epitaxial La0.67Ca0.33MnO3 / NdGaO3（001） thin films,with essentially the ferromagnetic metal ground state as observed for the bulk counterparts,has been realized via the anisotropic strain relaxation.These films show significant phase coexistence of ferromagnetic metallic state and charge ordering insulating state.By changing the film thickness and postannealing temperature,the COI phase can be tuned.A marked thermal hysteresis behavior has been observed and a huge low-field magnetoresistance（LFMR） was obtained in the epitaxial system.The LFMR that occurred in a wide temperature range makes the approach promising for device applications.The results demonstrate the crucial role of anisotropic strain in inducing the charge ordering insulating state in manganites films.

同期刊论文项目
电荷有序和铁电薄膜外延异质结构中的各向异性应力耦合与磁电效应
期刊论文 22
新型类钙钛矿氧化物功能材料的合成、微结构与性能研究
期刊论文 133 会议论文 49 著作 1
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期刊信息
  • 《低温物理学报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国科学技术大学
  • 主编：赵忠贤
  • 地址：安徽省合肥市金寨路96号
  • 邮编：230026
  • 邮箱：LiBiyou@ustc.edu.cn
  • 电话：0551-3601359
  • 国际标准刊号：ISSN：1000-3258
  • 国内统一刊号：ISSN：34-1053/O4
  • 邮发代号:26-136
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  • 被引量:1577