Li- and Mg-doping into icosahedral boron crystals, α- and β-rhombohedral boron, targeting high-temperature superconductivity: Structure and electronic states

Kohei Soga, Atsushi Oguri, Satoshi Araake, Masami Terauchi, Akihiko Fujiwara, Kaoru Kimura

研究成果: Article査読

47 被引用数 (Scopus)

抄録

The possibility of high TC superconductivity is suggested for lithium- and magnesium-doped icosahedral boron crystals, α- and β-rhombohedral boron. The doping of these elements was attempted by a vapor diffusion processing. Both lithium and magnesium are hardly doped into the α-rhombohedral boron, although small amounts of metallic parts are found in the sample. In only one Li-doped sample, the metallic part contained 0.02vol% of the superconductive phase (TC∼36K). Magnesium was successfully doped into β-rhombohedral boron homogeneously up to 4at% (Mg4.1B105), although considerable amount of impurity silicon was introduced together with magnesium. The structures of the doped samples were analyzed assuming co-doping of magnesium and silicon. The relation between the site occupancies of the dopants and the lattice expansion is discussed. The estimation of the density of states near the Fermi energy by EELS and magnetic susceptibility measurements suggested a metal transition of the β-rhombohedral boron by the doping of magnesium and silicon. The relation between the metal transition and the intrinsic acceptor level is also discussed.

本文言語English
ページ(範囲)498-506
ページ数9
ジャーナルJournal of Solid State Chemistry
177
2
DOI
出版ステータスPublished - 2004 2月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 凝縮系物理学
  • 物理化学および理論化学
  • 無機化学
  • 材料化学

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