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Tip-induced superconductivity on the topological semimetals TaAs_2 and NbAs_2

机译:拓扑半球形上的尖端超导塔斯_2和NBAS_2

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摘要

TaAs_2 and NbAs_2 are members of the MPn_2 family with weak topological invariants of Z_2 = [0; 111]. Here, we report the tip-induced superconductivity achieved on both materials using the point-contact technique. Although the weak Z_2 number leads to strongly crystal-orientation-dependent surface states, we observed a universal relationship between the zero-temperature upper critical field H_(c2)(0) and the critical temperature T_C for different crystal orientations. Combined with first-principles calculations, the findings here could identify a bulk band, instead of the much speculated surface bands, playing the dominant role in the induced superconductivity. These results predict a great possibility to realize superconductivity in other members of the MPn_2 family possessing similar band structures and provide clues to understand the mechanism of tip-induced superconductivity.
机译:TAAS_2和NBAS_2是MPN_2系列的成员,Z_2的弱拓扑不变性= [0; 111]。在这里,我们使用点接触技术报告两种材料上实现的尖端诱导的超导性。虽然弱Z_2号导致强烈的晶体取向依赖性表面状态,但是我们观察到零温度上临界场H_(C2)(0)与不同晶体取向的临界温度T_C之间的通用关系。结合第一原理计算,这里的发现可以识别散装带,而不是大量推测的表面带,在诱导的超导性中扮演主导作用。这些结果预测了具有类似频带结构的MPN_2系列的其他成员中的超导能力,并提供线索以了解尖端诱导的超导性的机制。

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  • 来源
    《Physical review》 |2020年第8期|085139.1-085139.7|共7页
  • 作者单位

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science andInformation Technology Anhui University Hefei 230601 China;

    Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei 230031 China University of Science and Technology of China Hefei 230026 China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China;

    Department of Physics Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of China Beijing 100872 China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China;

    Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei 230031 China;

    Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science andInformation Technology Anhui University Hefei 230601 China;

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