Abstract: We synthesized superconducting fullerene nanowhiskers (C60NWs) 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 C60 nanowhiskers (KxC60NWs), while the superconducting volume fractions changed with x. The highest shielding fraction of a full shielding volume was observed in the material of K3.3C60NW by heating at 200 °C. On the other hand, that of a K-doped fullerene (K-C60) crystal was less than 1%. We report the superconducting behaviors of our newly synthesized KxC60NWs in comparison to those of KxC60 crystals, which show superconductivity at 19 K in K3C60. The lattice structures are also discussed, based on the x-ray diffraction (XRD) analyses.
Keywords: fullerene nanowhisker; superconductor; potassium intercalation
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Takeya, H.; Miyazawa, K.; Kato, R.; Wakahara, T.; Ozaki, T.; Okazaki, H.; Yamaguchi, T.; Takano, Y. Superconducting Fullerene Nanowhiskers. Molecules 2012, 17, 4851-4859.
Takeya H, Miyazawa K, Kato R, Wakahara T, Ozaki T, Okazaki H, Yamaguchi T, Takano Y. Superconducting Fullerene Nanowhiskers. Molecules. 2012; 17(5):4851-4859.
Takeya, Hiroyuki; Miyazawa, Kun’ichi; Kato, Ryoei; Wakahara, Takatsugu; Ozaki, Toshinori; Okazaki, Hiroyuki; Yamaguchi, Takahide; Takano, Yoshihiko. 2012. "Superconducting Fullerene Nanowhiskers." Molecules 17, no. 5: 4851-4859.