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Electron microscope imaging for gadolinium metallofullerenes encapsulating in single-wall carbon nanotubes ͓͑Gd@C 82 ͒ n @SWNTs͔ identifies the single Gd atom encaged in each. The intermolecular distance between Gd@C 82 is extremely regular, regarding the chains of Gd@C 82 as novel onedimensional crystals. Chemical state analysis of Gd atoms suggests evidence for charge transfer from Gd to either a fullerene cage or a nanotube. The slopes of the temperature dependence of electric resistance fordoi:10.1103/physrevlett.85.5384 pmid:11136002 fatcat:hubqesiae5aptd3rwtn2sqeht4