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首页> 外文期刊>Physical review >Angle-resolved photoemission observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe_(0.75)Ru_(0.25))_2As_2
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Angle-resolved photoemission observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe_(0.75)Ru_(0.25))_2As_2

机译:等价Ru-取代的Ba(Fe_(0.75)Ru_(0.25))_ 2As_2中各向同性超导间隙的角分辨光发射观察

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摘要

We used high-energy resolution angle-resolved photoemission spectroscopy to extract the momentum dependence of the superconducting gap of Ru-substituted Ba(Fe_(0.75)Ru_(0.25))_2As_2 (T_c = 15 K). Despite a strong out-of-plane warping of the Fermi surface, the magnitude of the superconducting gap observed experimentally is nearly isotropic and independent of the out-of-plane momentum. More precisely, we respectively observed 5.7 and 4.5 meV superconducting gaps on the inner and outer Γ-centered hole Fermi surface pockets, whereas a 4.8 meV gap is recorded on the M-centered electron Fermi surface pockets. Our results are consistent with the J_1-J_2 model with a dominant antiferromagnetic exchange interaction between the next-nearest Fe neighbors.
机译:我们使用高能分辨角分辨光电子能谱来提取Ru取代的Ba(Fe_(0.75)Ru_(0.25))_ 2As_2(T_c = 15 K)的超导间隙的动量依赖性。尽管费米表面发生了强烈的平面外翘曲,但实验观察到的超导间隙的大小几乎是各向同性的,并且与平面外动量无关。更准确地说,我们分别在以Γ为中心的内部和外部空穴中心的费米表面囊上观察到5.7和4.5 meV的超导间隙,而在以M为中心的电子费米表面囊上记录了4.8 meV的间隙。我们的结果与下一个最近的Fe邻居之间具有主要反铁磁交换相互作用的J_1-J_2模型一致。

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  • 来源
    《Physical review》 |2013年第9期|094513.1-094513.5|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;

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

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

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

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China ,Centre de Physique Theorique, Ecole Polytechnique, CNRS-UMR7644, 91128 Palaiseau, France;

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

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan ,TRiP, Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan;

    Helmholtz-Zentrum Berlin, BESSY, D-12489 Berlin, Germany;

    Institute for Solid State Research, IFW Dresden, D-01171 Dresden, Germany;

    Center for Superconducting Physics and Materials, National Laboratory for Solid State Microstructures, Department of Physics,Nanjing University, Nanjing 210093, China;

    Center for Superconducting Physics and Materials, National Laboratory for Solid State Microstructures, Department of Physics,Nanjing University, Nanjing 210093, China;

    Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan ,WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;

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

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  • 正文语种 eng
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  • 关键词

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

    机译:电子结构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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