Superconductivity of doped Ar@C60

Kenichi Yakigaya, Atsuhiko Takeda, Yasunori Yokoyama, Seitaro Ito, Takashi Miyazaki, Tomohiro Suetsuna, Hidekazu Shimotani, Toru Kakiuchi, Hiroshi Sawa, Hidenori Takagi, Koichi Kitazawa, Nita Dragoe

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

A substantial amount of endohedral fullerene, Ar@C60 (>1 mg), was successfully obtained by heat treatment of C60 powder under high pressure Ar atmosphere, followed by sequential HPLC separation. The isolation of pure Ar@C60 was demonstrated by TOF-MS, 13C NMR spectroscopy and powder X-ray diffraction. We report here the synthesis of the first endohedral fullerene superconductors, K3(Ar@C60) and Rb3(Ar@C60) having critical temperatures of about 18 and 27 K, respectively. The decrease of Tc (ΔTc) in both K3(Ar@C60) and Rb3(Ar@C60) compared with pristine compounds (ΔTc >1 K and >2 K, respectively) is rather large, implying that the influence of encapsulated Ar atom on the C60 cage and therefore to the superconductivity of its derivatives, is more pronounced than expected. Indeed, synchrotron X-ray powder diffraction results showed, rather unexpectedly, that Ar@C60 and C60 have different unit cell parameters therefore different van der Waals radii.

Original languageEnglish
Pages (from-to)973-979
Number of pages7
JournalNew Journal of Chemistry
Volume31
Issue number6
DOIs
Publication statusPublished - 2007

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

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