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首页> 外文期刊>Physical review >Photoemission and muon spin relaxation spectroscopy of the iron-based Rb_(0.77)Fe_(1.61)Se_2 superconductor: Crucial role of the cigar-shaped Fermi surface
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Photoemission and muon spin relaxation spectroscopy of the iron-based Rb_(0.77)Fe_(1.61)Se_2 superconductor: Crucial role of the cigar-shaped Fermi surface

机译:铁基Rb_(0.77)Fe_(1.61)Se_2超导体的光发射和μ自旋弛豫光谱:雪茄形费米表面的关键作用

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摘要

In this study, we investigate the electronic and magnetic properties of Rb_(0.77)Fe_(1.61)Se_2 (T_c = 32.6 K) in normal and superconducting states by means of photoemission and μSR spectroscopies as well as band-structure calculations. We demonstrate that the unusual behavior of these materials is the result of separation into metallic (~12%) and insulating (~88%) phases. Only the former becomes superconducting and has a usual electronic structure of electron-doped FeSe slabs. Our results thus imply that the antiferromagnetic insulating phase is just a by-product of Rb intercalation and its magnetic properties have no direct relation to the superconductivity. Instead, we find that also in this class of iron-based compounds, the key ingredient for superconductivity is a certain proximity of a Van Hove singularity to the Fermi level.
机译:在这项研究中,我们通过光发射和μSR光谱以及能带结构计算研究了Rb_(0.77)Fe_(1.61)Se_2(T_c = 32.6 K)在正常和超导状态下的电子和磁性。我们证明了这些材料的异常行为是分离成金属(〜12%)和绝缘(〜88%)相的结果。只有前者变为超导,并具有电子掺杂的FeSe平板的常规电子结构。因此,我们的结果表明,反铁磁绝缘相只是Rb插层的副产物,其磁性能与超导性没有直接关系。相反,我们发现在这类铁基化合物中,超导性的关键因素是范霍夫奇异点与费米能级一定程度的接近。

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  • 来源
    《Physical review》 |2013年第13期|134501.1-134501.7|共7页
  • 作者单位

    Institute for Solid State Research, IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany;

    Institute for Solid State Research, IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany;

    Institute for Solid State Research, IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany;

    Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany;

    Institute for Solid State Research, IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany,G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine, 36 Academician Vernadsky blvd., Kiev, 03680 Ukraine;

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Institut fuer Festkoerperphysik, Technische Universitaet Dresden. D-01171 Dresden, Germany;

    Helmholtz-Zentrum Berlin, Albert-Einstein-Strasse 15,12489 Berlin. Germany;

    Institute for Solid State Research, IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany,Institut fuer Festkoerperphysik, Technische Universitaet Dresden. D-01171 Dresden, Germany;

    Institute for Solid State Research, IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    electronic structure; photoemission and photoelectron spectra;

    机译:电子结构光发射和光电子能谱;

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