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首页> 外文期刊>Physical review >Electronic nematic correlations in the stress-free tetragonal state of BaFe_(2-x)Ni_xAs_2
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Electronic nematic correlations in the stress-free tetragonal state of BaFe_(2-x)Ni_xAs_2

机译:BaFe_(2-x)Ni_xAs_2无应力四方状态下的电子向列相关

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摘要

We use transport and neutron scattering to study electronic, structural, and magnetic properties of the electron-doped BaFe_(2-x)Ni_xAs2 iron pnictides in uniaxial-strained and external-stress-free detwinned states. Using a specially designed in situ mechanical detwinning device, we demonstrate that the in-plane resistivity anisotropy observed in the uniaxial-strained tetragonal state of BaFe_(2-x)Ni_xAs_2 below a temperature T~*, previously identified as a signature of the electronic nematic phase, is also present in the stress-free tetragonal phase below T~(**) (<T~*). By carrying out neutron scattering measurements on BaFe_2As_2 and BaFe_(1.97)Ni_(0.03)As_2, we argue that the resistivity anisotropy in the stress-free tetragonal state of iron pnictides arises from the magnetoelastic coupling associated with antiferromagnetic order. These results thus indicate that the local lattice distortion and nematic spin correlations are responsible for the resistivity anisotropy in the tetragonal state of stress-free iron pnictides, and suggest that resistivity anisotropy, spin excitation anisotropy, and orbital ordering found in the paramagnetic state of uniaxial-strained iron pnictides are due to the externally applied uniaxial strain via an enhanced nematic susceptibility.
机译:我们使用传输和中子散射来研究单轴应变和无外应力解缠态的电子掺杂BaFe_(2-x)Ni_xAs2铁素体的电子,结构和磁性。使用专门设计的原位机械解缠装置,我们证明了BaFe_(2-x)Ni_xAs_2的单轴应变四方状态下在低于温度T〜*的情况下观察到的面内电阻率各向异性,先前已将其识别为电子的特征向列相也存在于T〜(**)(<T〜*)以下的无应力四方相中。通过对BaFe_2As_2和BaFe_(1.97)Ni_(0.03)As_2进行中子散射测量,我们认为铁素化物的无应力四方状态下的电阻率各向异性是由与反铁磁有序相关的磁弹性耦合引起的。因此,这些结果表明局部晶格畸变和向列自旋相关性是无应力铁素体四方状态下电阻率各向异性的原因,并表明在单轴顺磁态下存在电阻率各向异性,自旋激发各向异性和轨道有序性应变铁肽是由于向列磁化率增强而从外部施加的单轴应变。

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  • 来源
    《Physical review》 |2015年第13期|134521.1-134521.9|共9页
  • 作者单位

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA ,Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China ,Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;

    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;

    Institut Laue-Langevin, 6, rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France;

    Institut Laue-Langevin, 6, rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany ,Max Planck Society Outstation at the Forschungsneutronenquelle Heinz Maier-Leibnitz (MLZ), D-85747 Garching, Germany;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;

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

    electronic structure; superconducting materials; neutron inelastic scattering;

    机译:电子结构超导材料;中子非弹性散射;

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