Superconducting Fullerene Nanowhiskers

Molecules

Hiroyuki Takeya¹  Kun’ichi Miyazawa¹  Ryoei Kato¹  Takatsugu Wakahara¹  Toshinori Ozaki¹  Hiroyuki Okazaki¹  Takahide Yamaguchi¹ 

[1] ¹National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan ²Transformative Research Project on Iron Pnictides (TRIP), Japan Science and Technology Agency, Chiyoda-ku, Tokyo 102-0075, Japan

关键词: fullerene nanowhisker;    superconductor;    potassium intercalation;   

DOI  :  10.3390/molecules17054851

来源: mdpi

【 摘 要 】

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 (K_xC₆₀NWs), while the superconducting volume fractions changed with x. The highest shielding fraction of a full shielding volume was observed in the material of K_3.3C₆₀NW 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 K_xC₆₀NWs in comparison to those of K_xC₆₀ crystals, which show superconductivity at 19 K in K₃C₆₀. The lattice structures are also discussed, based on the x-ray diffraction (XRD) analyses.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.