Superconductivity in Li-doped α-rhombohedral boron

T. Nagatochi, H. Hyodo, A. Sumiyoshi, K. Soga, Y. Sato, M. Terauchi, F. Esaka, K. Kimura

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    20 Citations (Scopus)


    Metal transition and superconductivity were observed in Li-doped α-rhombohedral boron (α-B12). The authors have established a purification method and obtained a large amount of high-purity α-B12 powder. Li doping into purified α-B12 was attempted by vapor diffusion processing (VDP) in a Mo or Ta tube. Li-doped α-B12 contained metallic glittering particles. Meissner effects were observed in such a compound with the nominal composition Li xB12 (x = 1.0, 1.4, 1.5, 1.7, or 2.5) (Tc = 3.2-7 K). As for Li2.5B12, the temperature dependence of its electrical conductivity indicates a metallic character and its electrical resistivity drop is detected near the Meissner temperature. The existence of Li and Fermi edges in Li-doped α-B12 crystals was verified by transmission electron microscopy-electron energy loss spectroscopy (TEM-EELS). Lattice expansion, which is a well-known indicator of metal doping into a crystal, was also observed. Thus, Li doping into α-B12 was successfully achieved. Our work also suggests that it is possible to dope a larger amount of Li into α-B12 and to increase its T c.

    Original languageEnglish
    Article number184507
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Issue number18
    Publication statusPublished - 2011 May 16

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics


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