Issue 6, 2007

Superconductivity of doped Ar@C60

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 TcTc) 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.

Graphical abstract: Superconductivity of doped Ar@C60

Article information

Article type
Paper
Submitted
17 Jan 2007
Accepted
03 Apr 2007
First published
17 Apr 2007

New J. Chem., 2007,31, 973-979

Superconductivity of doped Ar@C60

K. Yakigaya, A. Takeda, Y. Yokoyama, S. Ito, T. Miyazaki, T. Suetsuna, H. Shimotani, T. Kakiuchi, H. Sawa, H. Takagi, K. Kitazawa and N. Dragoe, New J. Chem., 2007, 31, 973 DOI: 10.1039/B700726D

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