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Electronic phase transition in hollandite titanates Ba_xTi_8O_(16+δ)

机译:钙钛矿钛矿酸盐Ba_xTi_8O_(16 +δ)中的电子相变

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摘要

We studied the physical properties of hollandite titanates, Ba_xTi_8O_(16+δ), which have double chains of edge-sharing TiO_6 octahedra with d electrons in the t_2% states. We found that there is an electronic phase transition at ~220 K, at which various properties exhibit anomalies. This phase transition is characterized by a modulation in the TiO_6 chains and a spectral weight transfer of over 2 eV in the optical conductivity spectrum, which are presumably caused by charge and orbital ordering of the Ti t_(2g) electrons.
机译:我们研究了钛白铁矿Ba_xTi_8O_(16 +δ)的物理性质,钛铁矿具有在t_2%态具有d个电子的边缘共享的TiO_6八面体双链。我们发现在〜220 K有一个电子相变,在该处各种性质表现出异常。这种相变的特征在于TiO_6链中的调制和光导谱中超过2 eV的光谱重量转移,这大概是由Ti t_(2g)电子的电荷和轨道排序引起的。

著录项

  • 来源
    《Physical review》 |2015年第22期|220408.1-220408.5|共5页
  • 作者单位

    Department of Physics, Waseda University, Tokyo 169-8555, Japan;

    Department of Physics, Waseda University, Tokyo 169-8555, Japan;

    Department of Nano-structures and Advanced Materials, Kagoshima University, Kagoshima 890-0065, Japan;

    Department of Materials Science and Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;

    Department of Materials Science, Osaka Prefecture University, Sakai 599-8531, Japan;

    Department of Materials Science, Osaka Prefecture University, Sakai 599-8531, Japan;

    Department of Physics, Waseda University, Tokyo 169-8555, Japan;

    Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan;

    Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan;

    Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan;

    Department of Physics, Waseda University, Tokyo 169-8555, Japan,Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, Tokyo 169-0051, Japan;

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

    thermoelectric and thermomagnetic effects; infrared and raman spectra;

    机译:热电和热磁效应;红外光谱和拉曼光谱;

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