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首页> 外文期刊>Physical review >Effect Of Electron-phonon Coupling On The Superconducting Transition Temperature In Dodecaboride Superconductors: A Comparison Of Lub_(12) With Zrb_(12)
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Effect Of Electron-phonon Coupling On The Superconducting Transition Temperature In Dodecaboride Superconductors: A Comparison Of Lub_(12) With Zrb_(12)

机译：电子-声子耦合对十二硼化物超导体中超导转变温度的影响：Lub_（12）与Zrb_（12）的比较

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摘要

We report a detailed study of specific heat, electrical resistivity, and optical spectroscopy in the superconducting boride LuB_(12) (T_c=0.4 K), and compare it to the higher T_c compound ZrB_(12) (T_c=6 K). Both compounds have the same structure based on enclosed metallic Lu or Zr ions in oversized boron cages. The infrared reflectivity and ellipsometry in the visible range allow us to extract the optical conductivity from 6 meV to 4 eV in the normal state from 20 to 280 K. By extracting the superconducting properties, phonon density of states, and electron-phonon coupling function from these measurements, we discuss the important factors governing T_c and explain the difference between the two compounds. The phonon density of states seems to be insignificantly modified by substitution of Zr with Lu. However, the soft vibrations of the metal ions in boron cages, responsible for the relatively high T_c in ZrB_(12), have almost no contribution to the electron-phonon coupling in LuB_(12).
机译：我们报告了对超导硼化物LuB_（12）（T_c = 0.4 K）中比热，电阻率和光谱的详细研究，并将其与更高的T_c化合物ZrB_（12）（T_c = 6 K）进行了比较。两种化合物基于超大尺寸硼笼中的封闭金属Lu或Zr离子具有相同的结构。可见光范围内的红外反射率和椭圆偏振法使我们能够从20到280 K的正常状态下从6 meV到4 eV提取光导率。通过从中提取超导性质，状态的声子密度和电子-声子耦合函数通过这些测量，我们讨论了控制T_c的重要因素并解释了这两种化合物之间的差异。用Lu取代Zr似乎对态的声子密度几乎没有影响。然而，导致ZrB_（12）中T_c较高的硼笼中金属离子的软振动几乎对LuB_（12）中的电子-声子耦合没有贡献。

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