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Spectral weight transfer in strongly correlated Fe_(1.03)Te

机译:强相关Fe_(1.03)Te的光谱重量转移

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摘要

The temperature dependence of the in-plane optical conductivity has been determined for Fe_(1.03) above and below the magnetic and structural transition at T_N approx= 68 K. The electron and hole pockets are treated as two separate electronic subsystems: a strong, broad Drude response that is largely temperature independent, and a much weaker, narrow Drude response with a strong temperature dependence. Spectral weight is transferred from high to low frequency below T_N, resulting in the dramatic increase of both the low-frequency conductivity and the related plasma frequency. The change in the plasma frequency is due to an increase in the carrier concentration resulting from the closing of the pseudogap on the electron pocket, as well as the likely decrease of the effective mass in the antiferromagnetic state.
机译:对于Fe_(1.03)在T_N大约= 68 K时的磁性和结构转变之上和之下,已确定了面内光导率的温度依赖性。电子和空穴被视为两个独立的电子子系统:强,宽Drude响应在很大程度上与温度无关,而Drude响应则弱得多,狭窄,并且对温度的依赖性强。频谱权重从低于T_N的高频转移到低频,从而导致低频电导率和相关的等离子体频率急剧增加。等离子体频率的变化是由于电子口袋上伪间隙的闭合导致载流子浓度的增加,以及在反铁磁状态下有效质量的可能下降。

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  • 来源
    《Physical review》 |2014年第12期|121114.1-121114.5|共5页
  • 作者单位

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA,University of Geneva, CH-1211 Geneva 4,Switzerland;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA,School of Chemical Engineering and Environment, North University of China, Taiyuan, Shanxi 030051, People's Republic of China;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

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

    infrared and raman spectra;

    机译:红外光谱和拉曼光谱;

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