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Magnetoresistance in granular CrO_2: Effects of variation in crystallographic and magnetic microstructure

机译:颗粒CrO_2中的磁阻:晶体学和磁微结构变化的影响

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摘要

We report magnetotransport measurements up to 5 Tesla on high purity sintered samples of granular CrO_2 with a significantly enhanced grain size. The negative magnetoresistance (MR) as derived from RH isotherms is observed to be unhysteretic up to temperatures as high as 200 K. RH isotherms exhibit some unusual features between 240 and 290 K, including a positive MR and strong pinning effects. These features disappear above 290 K and are apparently related with the magnetic state of the insulating grain boundary. Qualitatively similar features with significantly enhanced MR are also observed when CrO_2 is diluted with two antiferromagnetic oxides, Cr_2O_3 or Cr_2O_5. These results bring out the role played by the magnetic and crystallographic microstructure on the magnitude, sign, and hysteresis of the magnetoresistance in this technologically important material.
机译:我们报告了高纯度的颗粒状CrO_2烧结样品的磁传输测量值高达5 Tesla。观察到从RH等温线得出的负磁阻(MR)在高达200 K的温度下都不会滞后。RH等温线在240至290 K之间表现出一些不寻常的特征,包括正MR和强钉扎效应。这些特征在290 K以上消失,并且显然与绝缘晶界的磁性有关。当用两种反铁磁性氧化物Cr_2O_3或Cr_2O_5稀释CrO_2时,也观察到了具有明显增强的MR的定性相似特征。这些结果揭示了磁性和晶体显微组织在这种技术上重要的材料中对磁阻的大小,符号和磁滞的影响。

著录项

  • 来源
    《Journal of Applied Physics》 |2007年第10期|p.103911.1-103911.5|共5页
  • 作者

    A. Bajpai; A. K. Nigam;

  • 作者单位

    Institute for Solid State Research at IFW Dresden, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用物理学;计量学;
  • 关键词

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