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首页> 外文期刊>Physical review >Electronic band structure and momentum dependence of the superconducting gap in Ca_(1-x)Na_xFe_2As_2 from angle-resolved photoemission spectroscopy
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Electronic band structure and momentum dependence of the superconducting gap in Ca_(1-x)Na_xFe_2As_2 from angle-resolved photoemission spectroscopy

机译:角度分辨光发射光谱法研究Ca_(1-x)Na_xFe_2As_2中超导间隙的电子能带结构和动量依赖性

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摘要

Electronic structure of newly synthesized single crystals of calcium iron arsenide doped with sodium with T_c ranging from 33 to 14 K has been determined by angle-resolved photoemission spectroscopy (ARPES). The measured band dispersion is in general agreement with theoretical calculations, nonetheless implies absence of Fermi-surface nesting at an antiferromagnetic vector. A clearly developing below T_c strongly band-dependant superconducting gap has been revealed for samples with various doping levels. The BCS ratio for optimal doping, 2△/k_BT_c = 5.5, is substantially smaller than the numbers observed for related compounds.
机译:通过角分辨光发射光谱法(ARPES),确定了新合成的掺有T_c范围为钠的砷化铁钙钙的单晶的电子结构。测得的谱带色散与理论计算基本一致,尽管如此,它暗示在反铁磁矢量处不存在费米表面嵌套。对于具有各种掺杂水平的样品,已经揭示出在T_c以下明显发展的强带依赖性超导间隙。最佳掺杂的BCS比2△/ k_BT_c = 5.5,大大小于相关化合物的数量。

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  • 来源
    《Physical review》 |2013年第9期|094501.1-094501.6|共6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-lnstitute 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;

    Institute for Solid State Research, IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany ,Institute of Metal Physics of National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine;

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

    BESSY GmbH, Albert-Einstein-Strasse 15,12489 Berlin, Germany;

    BESSY GmbH, 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
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  • 关键词

    electronic structure; cryogenics; refrigerators, low-temperature equipment; electron density of states and band structure of crystalline solids; photoemission and photoelectron spectra;

    机译:电子结构低温冰箱;低温设备;态固体的电子态密度和能带结构;光发射和光电子能谱;

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