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Superconductivity in Boron-Doped Carbon Nanotubes |
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| Authors: | J. Haruyama M. Matsudaira J. Reppert A. Rao T. Koretsune S. Saito H. Sano Y. Iye |
| Affiliation: | 1. Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa, 229-8558, Japan 2. Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba, 277-8581, Japan 3. Japan Science and Technology Agency-CREST, 4-1-8 Hon-machi, Kawaguchi, Saitama, 332-0012, Japan 4. Department of Physics and Astronomy, Center for Optical Materials Science and Engineering Technologies, Clemson University, Clemson, SC, 29634, USA 5. Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo, 152-8551, Japan |
| Abstract: | Carbon nanotubes (CNTs), which are one-dimensional (1D) molecular conductors, have attracted considerable attention. However, none of the research has reported on superconductivity (SC) in carrier-doped CNTs. Here, we report on SC with the world??s highest transition temperature (T c) of 12 K in highly uniform thin films of boron-doped single-walled CNTs (B-SWNTs). We clarify correlation of SC with Fermi level tuning with van Hove singularities (VHS) in electronic density of states (DOS) in the SWNT. Moreover, we show fabrication of paper-like thin films consisting of a pseudo two-dimensional network of weakly coupled B-SWNTs (called the Buckypaper) and show an enhancement of the onset T c up to 19 K by applying only a small pressure. The present observations will shed light on the high feasibility of using CNTs as a 1D superconductor and also on the research of 1D electron correlation. |
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