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In-plane optical spectroscopy study on FeSe epitaxial thin film grown on SrTiO_3 substrate

机译：SrTiO_3衬底上生长的FeSe外延薄膜的面内光谱研究

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摘要

We perform in-plane optical spectroscopy measurement on (001) FeSe thin film grown on SrTiO_3 substrate by the pulsed laser deposition method. The study indicates that the low-frequency conductivity consists of two Drude components: a broad one which takes up most of the spectral weight and a very narrow one roughly below 100-150 cm"1. The narrow Drude component locates at so low frequencies that no such behavior was observed in iron pnictides. The overall plasma frequency is smaller than that of the FeAs-based compounds, suggesting a stronger correlation effect. Similar to iron pnictides, a temperature-induced spectral weight transfer is observed for FeSe. However, the relevant energy scale is smaller. Additionally, different from a recent angle-resolved photoemission spectroscopy measurement which revealed a spin density wave (SDW) order at low temperature for FeSe thin films grown on SrTiO_3 substrate, no signature of the band structure reconstruction arising from the formation of the SDW order is seen by optical measurement in the thick FeSe films.
机译：我们通过脉冲激光沉积法对在SrTiO_3衬底上生长的（001）FeSe薄膜进行了平面内光谱测量。研究表明，低频电导率由两个Drude分量组成：一个宽的Drude分量占据了大部分频谱权重，一个非常窄的分量大约在100-150 cm“ 1以下。狭窄的Drude分量位于如此低的频率，以至于在铁素化物中未观察到这种行为，总的等离子体频率小于FeAs基化合物，表明相关作用更强；与铁素化物类似，在FeSe中观察到温度引起的光谱重量转移。此外，它与最近的角度分辨光发射光谱法测量结果不同，后者揭示了在SrTiO_3衬底上生长的FeSe薄膜在低温下的自旋密度波（SDW）阶数，而没有谱带结构重建的特征。通过光学测量在厚的FeSe薄膜中可以看到SDW阶的形成。

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  • 来源
    《Physical review》 |2013年第14期|144517.1-144517.5|共5页
  • 作者

    R. H. Yuan; W. D. Kong; L. Yan; H. Ding; N. L. Wang;

  • 作者单位

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

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  • 正文语种 eng
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  • 关键词

    optical properties;

    机译：光学性质;

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