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Superconductivity in alkali-metal-doped picene

机译：掺杂碱金属的皮烯的超导性

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摘要

Efforts to identify and develop new superconducting materials continue apace, motivated by both fundamental science and the prospects for application. For example, several new superconducting material systems have been developed in the recent past, including calcium-intercalated graphite compounds, boron-doped diamond and-most prominently-iron arsenides such as LaO_(1-x)F_xFeAs (ref. 3). In the case of organic superconductors, however, no new material system with a high superconducting transition temperature (T_c) has been discovered in the past decade. Here we report that intercalating an alkali metal into picene, a wide-bandgap semiconducting solid hydrocarbon, produces metallic behaviour and superconductivity. Solid potassium-intercalated picene (K_x picene) shows T_c values of 7K and 18 K, depending on the metal content. The drop of magnetization in K_xpicene solids at the transition temperature is sharp (<2K), similar to the behaviour of Ca-intercalated graphite. The T_c of 18 K is comparable to that of K-intercalated C_(60) (ref. 4). This discovery of superconductivity in K_xpicene shows that organic hydrocarbons are promising candidates for improved T_c values.
机译：在基础科学和应用前景的推动下，鉴定和开发新的超导材料的工作仍在继续。例如，最近已经开发了几种新的超导材料系统，包括钙插层石墨化合物，掺硼金刚石和最显着的铁砷化物，例如LaO_（1-x）F_xFeAs（参考文献3）。但是，在有机超导体的情况下，在过去的十年中没有发现具有高超导转变温度（T_c）的新材料系统。在这里，我们报告说，将碱金属嵌入到宽带隙半导体固体碳氢化合物picene中会产生金属行为和超导性。取决于金属含量，固态的插层钾的pic烯（K_x ene烯）的T_c值为7K和18K。在过渡温度下，K_xpicene固体中的磁化强度下降非常明显（<2K），类似于嵌入Ca的石墨的行为。 18 K的T_c与插入K的C_（60）相当（参考文献4）。 K_xpicene中超导性的这一发现表明，有机烃是改善T_c值的有希望的候选者。

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  • 来源
    《Nature》 |2010年第7285期|76-79|共4页
  • 作者

    Ryoji Mitsuhashi; Yuta Suzuki; Yusuke Yamanari; Hiroki Mitamura; Takashi Kambe; rnNaoshi Ikeda; Hideki Okamoto; Akihiko Fujiwara; Minoru Yamaji; Naoko Kawasaki; rnYutaka Maniwa; Yoshihiro Kubozono;

  • 作者单位

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, Okayama University, Okayama 700-8530, Japan;

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, Okayama University, Okayama 700-8530, Japan;

    Department of Chemistry, Okayama University, Okayama 700-8530, Japan Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 812-8581, Japan;

    Japan Advanced Institute of Science and Technology, Ishikawa, 923-1292, Japan;

    Department of Chemistry and Chemical Biology, Gunma University, Kiryu 376-8515, Japan;

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan;

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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