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Stress-induced nematicity in EuFe_2As_2 studied by Raman spectroscopy

机译:拉曼光谱研究EuFe_2As_2中应力诱导的向列性

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摘要

We use polarized Raman scattering to study the structural phase transition in EuFe_2As_2, the parent compound of the 122-ferropnictide superconductors. The in-plane lattice anisotropy is characterized by measurements of the side surface with different strains induced by different preparation methods. We show that while a fine surface polishing leaves the samples free of residual internal strain, in which case the onset of the C_4 symmetry breaking is observed at the nominal structural phase transition temperature T_S, cutting the side surface induces a permanent fourfold rotational symmetry breaking spanning tens of degrees above T_S.
机译:我们使用极化拉曼散射来研究EuFe_2As_2的结构相变,EuFe_2As_2是122-ferropnictide超导体的母体化合物。面内晶格各向异性的特征在于通过不同制备方法引起的具有不同应变的侧面的测量。我们表明,尽管精细的表面抛光使样品没有残留的内部应变,但在这种情况下,在标称结构相变温度T_S处观察到C_4对称断裂的发生,但切割侧面会引起永久性的四倍旋转对称断裂。比T_S高几十度。

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  • 来源
    《Physical review》 |2016年第1期|014513.1-014513.5|共5页
  • 作者单位

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA;

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6114, USA;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Collaborative Innovation Center of Quantum Matter, Beijing, China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Collaborative Innovation Center of Quantum Matter, Beijing, China;

    Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA,National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia;

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