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首页> 外文期刊>Physical review >Strong correlation effects in the A-site ordered perovskite CaCu_3Ti_4O_(12) revealed by angle-resolved photoemission spectroscopy
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Strong correlation effects in the A-site ordered perovskite CaCu_3Ti_4O_(12) revealed by angle-resolved photoemission spectroscopy

机译:角度分辨光发射光谱法揭示A位有序钙钛矿CaCu_3Ti_4O_(12)中的强相关效应

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摘要

We report angle-resolved photoemission spectroscopy results of A-site ordered perovskite CaCu_3Ti_4O_(12). We have observed the clear band dispersions, which are shifted to the higher energy by 1.7 eV and show the band narrowing around 2 eV in comparison with the local density approximation calculations. In addition, the high-energy multiplet structures of Cu 3d~8 final states have been found around 8-13 eV. These results reveal that CaCu_3Ti_4O_(12) is a Mott-type insulator caused by the strong correlation effects of the Cu 3d electrons well hybridized with O 2p states. Unexpectedly, there exists a very small spectral weight at the Fermi level in the insulator phase, indicating the existence of isolated metallic states.
机译:我们报告的角度解析光发射光谱结果的A站点订购钙钛矿CaCu_3Ti_4O_(12)。我们已经观察到清晰的频带色散,该频带向更高的能量移动了1.7 eV,并且与局部密度近似计算相比,显示出频带在2 eV附近变窄。另外,在8-13 eV附近发现了Cu 3d〜8最终态的高能多重结构。这些结果表明,CaCu_3Ti_4O_(12)是Mott型绝缘体,这是由于与O 2p态充分杂化的Cu 3d电子的强相关效应引起的。出乎意料的是,在绝缘子相的费米能级处存在非常小的光谱权重,表明存在孤立的金属态。

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  • 来源
    《Physical review》 |2013年第20期|205133.1-205133.5|共5页
  • 作者单位

    Department of Advanced Physics, Hirosaki University, Hirosaki 036-8224, Japan;

    Faculty of Education, Shiga University, Otsu 520-0862, Japan;

    Department of Advanced Physics, Hirosaki University, Hirosaki 036-8224, Japan;

    Department of Advanced Physics, Hirosaki University, Hirosaki 036-8224, Japan;

    Department of Advanced Physics, Hirosaki University, Hirosaki 036-8224, Japan;

    Department of Advanced Physics, Hirosaki University, Hirosaki 036-8224, Japan;

    Department of Advanced Physics, Hirosaki University, Hirosaki 036-8224, Japan;

    Center for Fostering Young and Innovative Researchers, Nagoya Institute of Technology, Nagoya 466-8555, Japan;

    UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan,School of Physical Sciences, The Graduate University for Advanced Studies, Okazaki 444-8585, Japan;

    UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan,Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan;

    UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan,School of Physical Sciences, The Graduate University for Advanced Studies, Okazaki 444-8585, Japan,Graduate School of Frontier Biosciences, Osaka University, Suita 565-0871, Japan;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    metal-insulator transitions and other electronic transitions; photoemission and photoelectron spectra;

    机译:金属-绝缘体过渡和其他电子过渡;光发射和光电子能谱;

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