arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.03572cond-mat.supr-concond-mat.mtrl-sci
收藏

有机金属化合物的超导电性

Superconductivity in an organometallic compound

Ren-Shu Wang, Liu-Cheng Chen, Hui Yang, Ming-An Fu, Jia Cheng, Xiao-Lin Wu, Yun Gao, Zhong-Bing Huang, Xiao-Jia Chen

摘要:

有机化合物构成了一个非常大的物质组,其包含至少一个金属-碳键,其中碳是有机基团的一部分。它们在化学科学的发展中发挥了重要作用。这些化合物在很大程度上用作催化剂(增加反应速率而自身不被消耗的物质)和实验室和工业中的中间体。近年来,新的量子现象如拓扑绝缘体和超导体也被提出。然而,目前还没有关于拓扑态的实验探索的报道。尽管人们付出了大量的努力,但迄今为止还没有任何有机金属化合物从零电阻态超导的证据。在这里,我们报告的实验实现的超导性的临界温度为3.6 K的钾掺杂的有机金属化合物,$ i.e.$ tri- $o$ -tolylbismuthine的迈斯纳效应和零电阻率状态的证据,通过$dc$和$ac$的磁化率和电阻率测量。所获得的超导参数将该化合物归类为II型超导体。苯环被认为是这种苯基有机金属化合物中必不可少的超导单元。通过X射线衍射、理论计算和拉曼光谱测量相结合的研究,确定了超导相及其组成。这些发现丰富了有机金属化合物在超导领域的应用,并为有机超导体增添了一个新的电子受体家族。这项工作也为从有机金属化合物中发现超导体指明了方向。

英文摘要:

Organometallic compounds constitute a very large group of substances that contain at least one metal-to-carbon bond in which the carbon is part of an organic group. They have played a major role in the development of the science of chemistry. These compounds are used to a large extent as catalysts (substances that increase the rate of reactions without themselves being consumed) and as intermediates in the laboratory and in industry. Recently, novel quantum phenormena such as topological insulators and superconductors were also suggested in these materials. However, there has been no report on the experimental exploration for the topological state. Evidence for superconductivity from the zero-resistivity state in any organometallic compound has not been achieved yet, though much efforts have been devoted. Here we report the experimental realization of superconductivity with the critical temperature of 3.6 K in a potassium-doped organometallic compound, $ i.e.$ tri-$o$-tolylbismuthine with the evidence of both the Meissner effect and the zero-resistivity state through the $dc$ and $ac$ magnetic susceptibility and resistivity measurements. The obtained superconducting parameters classify this compound as a type-II superconductor. The benzene ring is identified to be the essential superconducting unit in such a phenyl organometallic compound. The superconducting phase and its composition are determined by the combined studies of the X-ray diffraction and theoretical calculations as well as the Raman spectroscopy measurements. These findings enrich the applications of organometallic compounds in superconductivity and add a new electron-acceptor family for organic superconductors. This work also points to a large pool for finding superconductors from organometallic compounds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑