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Optical properties of superconducting pressurized LaH_(10)

机译：超导加压LAH_（10）的光学性质

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摘要

Recently superconductivity has been discovered at around 200 K in a hydrogen sulfide system and around 260 K in a lanthanum hydride system, both under pressures of about 200 GPa. These record-breaking transition temperatures bring within reach the long-term goal of obtaining room-temperature superconductivity. We have used first-principles calculations based on density functional theory along with Migdal-Eliashberg theory to investigate the electron-phonon mechanism for superconductivity in the Fm3m phase proposed for the LaH_(10) superconductor. We show that the very high transition temperature T_c results from a highly optimized electron-phonon interaction that favors coupling to high-frequency hydrogen phonons. Various superconducting properties are calculated, such as the energy gap. the isotope effect, the specific heat jump at T_c, the thermodynamic critical field, and the temperature-dependent penetration depth. However, our main emphasis is on the finite-frequency optical properties, measurement of which may allow for an independent determination of T_c and also a confirmation of the mechanism for superconductivity.
机译：最近在硫化氢系统中约为200k左右发现的超导性，并且在镧氢化物体系中约为260k，两者在约200GPa的压力下。这些破碎的过渡温度带来达到获得室温超导性的长期目标。我们使用了基于密度泛函理论的第一原理计算以及MIGDAL-ELIASHBERG理论，以研究为LAH_（10）超导体所提出的FM3M相中的超导电性的电子 - 声子机构。我们表明，非常高的过渡温度T_C由高度优化的电子 - 声子相互作用产生，其利用耦合到高频氢声子。计算各种超导特性，例如能隙。同位素效应，在T_C，热力学临界场和温度依赖性渗透深度处的特定热跳跃。然而，我们的主要重点是在有限频率的光学性质上，其测量可以允许独立测定T_C，并且还可以确认超导电性的机制。

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  • 来源
    《Physical review》 |2020年第2期|024501.1-024501.8|共8页
  • 作者

    S. F. Elatresh; T. Timusk; E. J. Nicol;

  • 作者单位

    Department of Physics University of Guelph Guelph Ontario Canada N1G 2W1 and Department of Chemistry and Chemical Biology Cornell University Baker Laboratory Ithaca New York 14853-1301 USA;

    Department of Physics and Astronomv McMaster University Hamilton Ontario Canada L8S 4M1;

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

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