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Comparison of pressurized sulfur hydride with conventional superconductors

机译：加压氢化硫与常规超导体的比较

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摘要

A recent report that sulfur hydride under pressure is an electron-phonon superconductor with a T_c of 190 K has been met with much excitement although it is yet to be confirmed. Based on several electron-phonon spectral density functions already available from density functional theory, we find that the electron-phonon spectrum is near optimum for T_c with a particularly large value of its characteristic phonon energy ω_(In) which is due to the small hydrogen mass. We find that the thermodynamic universal BCS ratios are near those for Pb and Nb_3Sn. We suggest that optical measurements could be a useful tool to establish the existence and nature of the superconductivity in this system. Conventional superconductors are in the impurity-dominated dirty limit. By contrast sulfur hydride will be in the clean limit because of its large energy gap scale. The ac optical conductivity will display distinct and separate signatures of the superconducting gap in the low-energy impurity-dominated range of the optical spectrum and additional phonon structures at higher energies where the clean limit applies.
机译：最近的报道称，在压力下氢化硫是T_c为190 K的电子声子超导体，尽管尚未得到证实，但令人兴奋。基于密度泛函理论已提供的几个电子声子光谱密度函数，我们发现，由于氢的含量很小，T_c的电子声子光谱接近最佳，其特征声子能量ω_（In）值特别大。质量我们发现热力学通用BCS比接近于Pb和Nb_3Sn。我们建议光学测量可能是建立该系统中超导性的存在和性质的有用工具。常规的超导体处于杂质占主导的脏极限。相比之下，氢化硫由于其能隙规模大而处于清洁极限。交流光导率将在光谱的低能量杂质占主导的范围内显示超导间隙的独特特征，并且在适用清洁极限的情况下，在较高能量下会显示额外的声子结构。

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  • 来源
    《Physical review》 |2015年第22期|220507.1-220507.4|共4页
  • 作者

    E. J. Nicol; J. P. Carbotte;

  • 作者单位

    Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada;

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada,The Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada;

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  • 正文语种 eng
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  • 关键词

    BCS theory and its development; optical properties; pressure effects;

    机译：BCS理论及其发展;光学性质压力效应;

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