title: Superconducting fullerene nanowhiskers.
abstract: We synthesized superconducting fullerene nanowhiskers (C(60)NWs) by potassium (K) intercalation. They showed large superconducting volume fractions, as high as 80%. The superconducting transition temperature at 17 K was independent of the K content (x) in the range between 1.6 and 6.0 in K-doped C(60) nanowhiskers (K(x)C(60)NWs), while the superconducting volume fractions changed with x. The highest shielding fraction of a full shielding volume was observed in the material of K(3.3)C(60)NW by heating at 200 °C. On the other hand, that of a K-doped fullerene (K-C(60)) crystal was less than 1%. We report the superconducting behaviors of our newly synthesized K(x)C(60)NWs in comparison to those of K(x)C(60) crystals, which show superconductivity at 19 K in K(3)C(60). The lattice structures are also discussed, based on the x-ray diffraction (XRD) analyses.
authors.affiliation: National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan. takeya.hiroyuki@nims.go.jp
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Takeya
authors.forename: Kun'ichi
authors.initials: K
authors.lastname: Miyazawa
authors.forename: Ryoei
authors.initials: R
authors.lastname: Kato
authors.forename: Takatsugu
authors.initials: T
authors.lastname: Wakahara
authors.forename: Toshinori
authors.initials: T
authors.lastname: Ozaki
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Okazaki
authors.forename: Takahide
authors.initials: T
authors.lastname: Yamaguchi
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Takano
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D004553:Electric Conductivity; D037741:Fullerenes / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D011188:Potassium / Q000737:chemistry; D013696:Temperature
chemical_list: D037741:Fullerenes; D011188:Potassium