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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
JournalPhysica C: Superconductivity and its Applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - 2010 Dec
Externally publishedYes

Fingerprint

Superconductivity
Potassium
potassium
superconductivity
Boron
Fermi surface
Polycrystals
polycrystals
Superconducting materials
Fermi surfaces
Vacancies
Electronic structure
Hysteresis
Magnetization
boron
Metals
hysteresis
occurrences
electronic structure
Transmission electron microscopy

Keywords

  • Boride superconductor
  • Electronic structure
  • Hexaboride
  • KB
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

On the possibility of MgB2-like superconductivity in potassium hexaboride. / Katsura, Yukari; Yamamoto, Ayako; Ogino, Hiraku; Horii, Shigeru; Shimoyama, Jun Ichi; Kishio, Kohji; Takagi, Hidenori.

In: Physica C: Superconductivity and its Applications, Vol. 470, No. SUPPL.1, 12.2010.

Research output: Contribution to journalArticle

Katsura, Yukari ; Yamamoto, Ayako ; Ogino, Hiraku ; Horii, Shigeru ; Shimoyama, Jun Ichi ; Kishio, Kohji ; Takagi, Hidenori. / On the possibility of MgB2-like superconductivity in potassium hexaboride. In: Physica C: Superconductivity and its Applications. 2010 ; Vol. 470, No. SUPPL.1.
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AU - Takagi, Hidenori

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