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arXiv 1703.06641cond-mat.supr-concond-mat.mtrl-sci
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链状分子中120 K以上的超导性

Superconductivity above 120 kelvin in a chain link molecule

Ren-Shu Wang, Yun Gao, Zhong-Bing Huang, Xiao-Jia Chen

摘要:

寻找具有更高临界温度$T_{c}^{\prime}$ s的新型超导化合物一直是超导科学研究的核心。自从超导性被发现以来,科学家们花了75年的时间才将$T_{c}$推到液氮沸点以上。到目前为止,在一些多层Hg(Tl)-Ba-Ca-Cu-O化合物中,已报道了大气压下约130 K的最高$T_{c}$。同时,硫氢化物体系在约150 GPa的高压下保持约200 K的最高$T_{c}$。在保持这些超导记录的同时,这些超导体的毒性或超导性对极压条件的要求限制了它们的技术应用。在这里,我们表明,掺杂的链连接分子$-$ $p$ -三联苯钾可以带来超导电性在123 K在大气压下,这是可比的最高$T_{c}$在铜酸盐。这种新型超导体的易加工性、重量轻、塑料的耐用性和环境友好性具有很大的电性能微调潜力。该研究为探索链状有机分子的高温超导性提供了一个窗口。

英文摘要:

The search for new superconducting compounds with higher critical temperatures $T_{c}^{\prime}$s has long been the very heart of scientific research on superconductivity. It took 75 years for scientists to push the $T_{c}$ above liquid nitrogen boiling temperature since the discovery of superconductivity. So far, the record high $T_{c}$ of about 130 K at atmosphere pressure was reported in some multilayer Hg(Tl)-Ba-Ca-Cu-O compounds. Meanwhile, sulfur hydride system holds the highest $T_{c}$ of around 200 K at high pressure of about 150 GPa. While keeping these records for superconductivity, either the toxicity of these superconductors or the requirement of extreme pressure condition for superconductivity limits their technology applications. Here we show that doping a chain link molecule $-$ $p$-terphenyl by potassium can bring about superconductivity at 123 K at atmosphere pressure, which is comparable to the highest $T_{c}$ in cuprates. The easy processability, light weight, durability of plastics, and environmental friendliness of this kind of new superconductor have great potential for the fine-tuning of electrical properties. This study opens a window for exploring high temperature superconductivity in chain link organic molecules.

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