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La0．67Ca0．33MnO3／MgO复合体系中的电输运和磁电阻效应
  • ISSN号：1000-324X
  • 期刊名称：《无机材料学报》
  • 时间：0
  • 分类：TM271[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]华中科技大学物理系,武汉430074
  • 相关基金：国家自然科学基金（10374032,10574049）
作者： 任光明[1], 袁松柳[1], 缪菊红[1], 余功奇[1], 肖循[1], 尹诗岩[1]
关键词： 颗粒边界效应, 低场磁电阻, 自旋极化隧穿, 弱联结, grain boundary effect, low field magnetoresistance, spin polarized tunneling, weak-link
中文摘要：

用化学方法制备了（1-x）La0．67Ca0．33MnO3（LCMO）／xMgO颗粒复合体系．通过选择不同的前期预烧温度（Ts1）控制LCMO原粉的颗粒大小．研究表明，MgO的含量和LCMO的前期预烧温度对复合体系的电输运和磁电阻效应有显著的影响．对瓦1=1100℃的样品，仅在纯LCMO和x=1mol％的复合样品中可以观察到绝缘体金属转变．而对Ts1=900℃的样品，在x=7mol％的复合样品中还可以观察到绝缘体金属转变，其最大低场磁电阻（H=0．3T）从纯LCMO的5％增加到27％．SEM形貌分析表明MgO含量增加或LCMO前期预烧温度升高都使复合体系中LCMO颗粒之间的联结性减弱．运用自旋极化隧穿机理，对实验结果进行了讨论．

英文摘要：

A La0.67Ca0.33MnO3（LCMO）/MgO granular composite system was fabricated by a chemical route. The grain size of the parent LCMO powders can be altered by controlling the initial sin- tering temperature. It shows that electrical transport and magetoresistive properties of the composite system strongly depend on the MgO content and initial sintering temperatures. For the samples with Ts1=1100℃, the insulator-metal transition can be observed only in pure LCMO and the x=lmol% composite. However, For the samples with Ts1=900℃, the insulator-metal transition can still be observed in the x=7mol% composite in which the maximal low field magnetoresistance （H=0.3T） is enhanced from 5% in pure LCMO to 27%. SEM analysis shows that linking between LCMO grains is weakened with increasing MgO content or elevating the initial sintering temperature. The experimental results were discussed in terms of the spin polarized tunneling mechanism.

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期刊信息
  • 《无机材料学报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国科学院上海硅酸盐所
  • 主编：郭景坤
  • 地址：上海市定西路1295号
  • 邮编：200050
  • 邮箱：wjclxb@mail.sic.ac.cn
  • 电话：021-52411302
  • 国际标准刊号：ISSN：1000-324X
  • 国内统一刊号：ISSN：31-1363/TQ
  • 邮发代号:4-504
  • 获奖情况:
  • 获"中国百种杰出学术期刊"称号
  • 国内外数据库收录:
  • 美国化学文摘（网络版）,荷兰文摘与引文数据库,美国工程索引,美国剑桥科学文摘,美国科学引文索引（扩展库）,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊（2004版）,中国北大核心期刊（2008版）,中国北大核心期刊（2011版）,中国北大核心期刊（2014版）,瑞典开放获取期刊指南,中国北大核心期刊（2000版）
  • 被引量:21274