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Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides

机译:在铁素硫和硫属元素化物中检测到高于结构转变温度的轨道波动

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摘要

We use point-contact spectroscopy (PCS) to probe AEFe_2As_2 (AE = Ca, Sr, Ba) and Fe_(1+y)Te. For AE = Sr,Ba we detect orbital fluctuations above T_S while for AE = Ca these fluctuations start below T_S. Co doping preserves the orbital fluctuations while K doping suppresses it. The fluctuations are only seen at those dopings and temperatures where an in-plane resistive anisotropy is known to exist. We predict an in-plane resistive anisotropy of Fe_(1+y)Te above T_S. Our data are examined in light of the recent work by Lee and Phillips (arXiv: 1110.5917v2). We also study how joule heating in the PCS junctions impacts the spectra. Spectroscopic information is only obtained from those PCS junctions that are free of heating effects while those PCS junctions that are in the thermal regime display bulk resistivity phenomena.
机译:我们使用点接触光谱法(PCS)探测AEFe_2As_2(AE = Ca,Sr,Ba)和Fe_(1 + y)Te。对于AE = Sr,Ba,我们检测到高于T_S的轨道波动,而对于AE = Ca,则这些波动开始于T_S之下。 Co掺杂保留了轨道波动,而K掺杂则抑制了轨道波动。仅在已知存在面内电阻各向异性的那些掺杂和温度下才能看到波动。我们预测Fe_(1 + y)Te在T_S之上的面内电阻各向异性。我们根据Lee和Phillips(arXiv:1110.5917v2)的最新工作检查了我们的数据。我们还研究了PCS结中的焦耳加热如何影响光谱。光谱信息仅从没有热效应的那些PCS结中获得,而处于热状态的那些PCS结则显示体电阻率现象。

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  • 来源
    《Physical review》 |2012年第21期|p.214515.1-214515.10|共10页
  • 作者单位

    Department of Physics and the Frederick Seitz Material Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA;

    Department of Physics and the Frederick Seitz Material Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA;

    Department of Physics and the Frederick Seitz Material Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA;

    Cavendish Laboratory, J. J. Thomson Avenue, University of Cambridge, United Kingdom;

    Cavendish Laboratory, J. J. Thomson Avenue, University of Cambridge, United Kingdom;

    Cavendish Laboratory, J. J. Thomson Avenue, University of Cambridge, United Kingdom;

    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;

    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;

    Ames Laboratory & Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory & Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory & Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory & Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Department of Physics and the Frederick Seitz Material Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA;

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  • 正文语种 eng
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  • 关键词

    superconductivity phase diagrams;

    机译:超导相图;

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