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Metal-insulator transitions in epitaxial LaVO_3 and LaTiO_3 films

机译:外延LaVO_3和LaTiO_3薄膜中的金属绝缘体过渡

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摘要

We have demonstrated that epitaxial films of LaVO_3 and LaTiO_3 can exhibit metallicity though their bulk counterparts are Mott insulators. When LaTiO_3 films are compressively strained on SrTiO_3 substrates, we observe metallicity that is attributed largely to epitaxial strain-induced electronic structure modifications and secondarily to interface electronic reconstruction at the LaTiO_3VSrTiO_3 interface. However, when LaVO_3 films are compressively strained on SrTiO_3 substrates, the observed metallicity is primarily attributed to interface effects. Signatures of weak localization are observed at low temperature in LaVO_3 films in the temperature, film thickness, as well as magnetic field dependence of the magnetoresistance.
机译:我们已经证明,LaVO_3和LaTiO_3的外延膜可以显示金属性,尽管它们的大部分是Mott绝缘体。当LaTiO_3薄膜在SrTiO_3基板上压缩应变时,我们观察到金属性,这主要归因于外延应变引起的电子结构修饰,其次归因于LaTiO_3VSrTiO_3界面的界面电子重构。但是,当LaVO_3薄膜在SrTiO_3基板上压缩应变时,观察到的金属性主要归因于界面效应。在低温下,LaVO_3薄膜在温度,薄膜厚度以及磁阻的磁场依赖性方面都观察到了弱的局部化特征。

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  • 来源
    《Physical review》 |2012年第8期|081401.1-081401.4|共4页
  • 作者单位

    Department of Materials Science and Engineering, University of California, Berkeley, California 94720;

    Department of Materials Science and Engineering, University of California, Berkeley, California 94720;

    Department of Materials Science and Engineering, University of California, Berkeley, California 94720;

    Department of Materials Science and Engineering, University of California, Berkeley, California 94720;

    Department of Materials Science and Engineering, University of California, Berkeley, California 94720,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720;

    Department of Materials Science and Engineering, University of California, Berkeley, California 94720,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720,Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    electrical properties of specific thin films; metal-insulator transitions and other electronic transitions; transition-metal compounds;

    机译:特定薄膜的电性能;金属-绝缘体过渡和其他电子过渡;过渡金属化合物;

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