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arXiv 1908.03987cond-mat.supr-con
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二维Nb2C MXene中新的最高Tc超导电性

Novel highest-Tc superconductivity in two-dimensional Nb2C MXene

Zaheer Ud Din Babar, M. S. Anwar, Muhammad Mumtaz, Mudassir Iqbal, Ren-Kui Zheng, Deji Akinwande, Syed Rizwan

摘要:

目前,二维材料的超导性由于其潜在的技术应用而成为研究的热点。在这里,我们报告了在2D Nb 2C MXene中观察到的超导电性,其转变温度为12.5 K,这是迄今为止MXene中达到的最高转变温度。我们系统地优化了化学蚀刻工艺以从其Nb 2AlC MAX相合成Nb 2C MXene。X射线衍射(XRD)显示出清晰的(002)峰,表明MXene的成功形成,以及c-晶格参数从13.83埃显著增加到22.72埃,这表明Nb 2C MXene片的分层,如通过使用扫描电子显微镜的形态学研究所揭示的。迈斯纳效应是用超导量子干涉仪(SQUID:Quantum design)探测的。作为温度的函数的上临界场和下临界场遵循Ginzburg-Landau(GL)理论,表明Nb 2C MXene的超导性质。强的电子-声子相互作用和费米能级处的大态密度可能导致在如此高的转变温度下出现超导电性,这在理论上已经预测了Mo_2C MXene。我们的工作是2D MXene研究和潜在应用领域的重大进展。

英文摘要:

Currently, superconductivity in two-dimensional (2D) materials is a hot topic of research owing to their potential technological applications. Here, we report observation of superconductivity in a 2D Nb2C MXene with transition temperature of 12.5 K, which is the highest transition temperature in MXene attained till now. We systematically optimized the chemical etching process to synthesize the Nb2C MXene from its Nb2AlC MAX phase. The X-ray diffraction (XRD) shows a clear (002) peak indicating the successful formation of MXene as well as a significant increase in the c-lattice parameter from 13.83Å to 22.72Å that indicates the delamination of Nb2C MXene sheets as revealed by morphological study using scanning electron microscope. The Meissner effect is detected using superconducting quantum interference device (SQUID: Quantum design). Lower and upper critical fields as a function of temperature follow the Ginzburg-Landau (GL) theory indicating the superconducting nature of the Nb2C MXene. Strong-electron phonon interaction and the large density-of-states at Fermi level may cause the emergence of superconductivity at such a higher transition temperature which has theoretically been predicted for Mo2C MXene. Our work is a significant advancement in the field of research and potential applications of 2D MXene.

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。

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