Two-Dimensional Superconductivity in Intercalated Bilayer Graphene

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  • TAKAHASHI Takashi
    Department of Physics, Tohoku University WPI-Advanced Institute for Material Research, Tohoku University Center for Spintronics Research Network, Tohoku University
  • SUGAWARA Katsuaki
    Department of Physics, Tohoku University WPI-Advanced Institute for Material Research, Tohoku University
  • ICHINOKURA Satoru
    Department of Physics, University of Tokyo
  • TAKAYAMA Akari
    Department of Physics, University of Tokyo
  • HASEGAWA Shuji
    Department of Physics, University of Tokyo

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Other Title
  • 2層グラフェン層間化合物の2次元超伝導
  • 2ソウ グラフェンソウ カン カゴウブツ ノ 2ジゲン チョウデンドウ

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Abstract

<p>We have fabricated alkali metal (Li, Rb, Cs) and alkaline-earth metal (Ca) intercalated bilayer graphene on SiC substrate, and characterized them by low-energy electron diffraction, angle-resolved photoemission spectroscopy, and 4-point-probe measurements. We observed a free-electron-like state in the center of the Brillouin zone, called “interlayer state”, as well as the folded π/π* bands in Rb-, Cs-, and Ca-intercalated graphene, while it was absent in Li counterpart. Ca-intercalated bilayer graphene shows the zero-resistance below 4K, indicative of the two-dimensional superconductivity. These results suggest that the interlayer state plays an important role for the superconductivity in intercalated bilayer graphene.</p>

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 38 (9), 460-465, 2017

    The Surface Science Society of Japan

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