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首页> 外文期刊>Physical review >Electronic structure reconstruction of Ca_(1-x)Pr_xFe_2As_2 in the collapsed tetragonal phase
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Electronic structure reconstruction of Ca_(1-x)Pr_xFe_2As_2 in the collapsed tetragonal phase

机译:塌方四方相中Ca_(1-x)Pr_xFe_2As_2的电子结构重建

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摘要

We report the electronic structure reconstruction of Ca_(1-x)Pr_xFe_2As_2 in the low temperature collapsed tetragonal (CT) phase observed by angle-resolved photoemission spectroscopy. Different from Ca(Fe_(1-x)Rh_x)_2As_2 and the annealed CaFe_2As_2 where all hole Fermi surfaces are absent in their CT phases, the cylindrical hole Fermi surface still persists in the CT phase of Ca_(1-x)Pr_xFe_2As_2. Furthermore, we found at least three well separated electronlike bands around the zone corner in the CT phase of Ca_(1-x)Pr_xFe_2As_2, which are more dispersive than the electronlike bands in the high temperature tetragonal phase. Based on these observations, we propose that the weakening of correlations (as indicated by the reduced effective mass), rather than the lack of Fermi surface nesting, might be responsible for the absence of magnetic ordering and superconductivity in the CT phase.
机译:我们报告了通过角分辨光发射光谱法观察到的低温塌陷四方相(CT)相中Ca_(1-x)Pr_xFe_2As_2的电子结构重建。与Ca(Fe_(1-x)Rh_x)_2As_2和退火后的CaFe_2As_2(所有的孔费米表面都不存在其CT相)不同,圆柱形孔费米表面仍然保留在Ca_(1-x)Pr_xFe_2As_2的CT相中。此外,我们在Ca_(1-x)Pr_xFe_2As_2的CT相中的区域角附近发现至少三个良好分离的电子状能带,它们比高温四方相中的电子状能带更分散。基于这些观察结果,我们认为相关性的减弱(如有效质量降低所表明),而不是缺乏费米表面嵌套,可能是导致CT相中没有磁序和超导性的原因。

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  • 来源
    《Physical review》 |2014年第21期|214519.1-214519.8|共8页
  • 作者单位

    State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;

    State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences, Shanghai 200050, People's Republic of China;

    State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;

    State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;

    State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;

    State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;

    State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;

    State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;

    State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;

    State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;

    State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    electronic structure; superconducting materials; photoemission and photoelectron spectra; electron density of states and band structure of crystalline solids;

    机译:电子结构超导材料;光发射和光电子光谱;态固体的电子密度和能带结构;

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