On the possibility of MgB2-like superconductivity in potassium hexaboride

Yukari Katsura, Ayako Yamamoto, Hiraku Ogino, Shigeru Horii, Jun Ichi Shimoyama, Kohji Kishio, Hidenori Takagi

研究成果: Article査読

3 被引用数 (Scopus)

抄録

We discussed the possibility for occurrence of MgB2-like superconductivity in cubic hexaboride KB6, from experimental and theoretical points of view. We successfully synthesized KB6 polycrystals with different K-site occupancies (84-98%). Transmission electron microscopy revealed that K-site vacancies are randomly but anisotropically distributed. Magnetization measurements showed that KB6 is a paramagnetic metal, with a small hysteresis around ∼60 K. First-principles calculations indicated that KB6 has conductive covalent network of boron like in MgB2 superconductor. We found a clear difference between the Fermi surfaces of stoichiometric and hole-doped KB6, implying a possibility for control of electronic structure for superconductivity, by introduction of K-site deficiency.

本文言語English
ページ(範囲)S633-S634
ジャーナルPhysica C: Superconductivity and its applications
470
SUPPL.1
DOI
出版ステータスPublished - 2010 12月
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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