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首页> 外文期刊>Physical review >Conductivity of twin-domain-wall/surface junctions in ferroelastics: Interplay of deformation potential, octahedral rotations, improper ferroelectricity, and flexoelectric coupling
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Conductivity of twin-domain-wall/surface junctions in ferroelastics: Interplay of deformation potential, octahedral rotations, improper ferroelectricity, and flexoelectric coupling

机译：铁弹性体中双畴壁/表面结的电导率：形变势，八面体旋转，铁电不当和柔电耦合的相互作用

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摘要

Electronic and structural phenomena at the twin-domain-wall/surface junctions in the ferroelastic materials are analyzed. Carriers accumulation caused by the strain-induced band structure changes originated via the deformation potential mechanism, structural order parameter gradient, rotostriction, and flexoelectric coupling is explored. Approximate analytical results show that inhomogeneous elastic strains, which exist in the vicinity of the twin-domain-wall/surface junctions due to the rotostriction coupling, decrease the local band gap via the deformation potential and flexoelectric coupling mechanisms. This is the direct mechanism of the twin-wall static conductivity in ferroelastics and, by extension, in multiferroics and ferroelectries. On the other hand, flexoelectric and rotostriction coupling leads to the appearance of the improper polarization and electric fields proportional to the structural order parameter gradient in the vicinity of the twin-domain-wall/surface junctions. The "flexoroto" fields leading to the carrier accumulation are considered as an indirect mechanism of the twin-wall conductivity. Comparison of the direct and indirect mechanisms illustrates a complex range of phenomena directly responsible for domain-wall static conductivity in materials with multiple order parameters.
机译：分析了铁弹性材料中双畴壁/表面交界处的电子和结构现象。探索了由形变势能机理，结构序参数梯度，旋转收缩和柔电耦合引起的由应变引起的能带结构变化引起的载流子积累。近似分析结果表明，由于旋转约束耦合，存在于双畴壁/表面结合处附近的不均匀弹性应变通过变形势和柔电耦合机制减小了局部带隙。这是铁弹性体中的双壁静电导率的直接机理，进而扩展到多铁性体和铁电体中的双壁静电导率。另一方面，柔电和旋转伸缩耦合导致出现不正确的极化和与双畴壁/表面结附近的结构顺序参数梯度成比例的电场。导致载流子积累的“ flexoroto”场被认为是双壁电导率的间接机制。直接和间接机制的比较说明了多种现象的直接作用，这些现象直接导致了具有多阶参数的材料中的畴壁静电导率。

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  • 来源
    《Physical review》 |2012年第8期|085416.1-085416.10|共10页
  • 作者

    Eugene A. Eliseev; Anna N. Morozovska; Yijia Gu; Albina Y. Borisevich; Long-Qing Chen; Venkatraman Gopalan; Sergei V. Kalinin;

  • 作者单位

    Institute for Problems of Materials Science, National Academy of Science of Ukraine, 3, Krjijanovskogo, 03142 Kiev, Ukraine;

    Institute of Physics, National Academy of Science of Ukraine, 46, pr. Nauki, 03028 Kiev, Ukraine;

    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA;

    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA;

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

    piezoelectricity and electromechanical effects; surface conductivity and carrier phenomena;

    机译：压电和机电效应;表面电导率和载流子现象;

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