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Anisotropic interfacial superconductivity induced at point contacts on topological semimetal grey arsenic

中国科学:物理学、力学、天文学英文版 2023年第9期66卷 94-101页

作者： Meng-Di Zhang Qing Wang Xing-Yuan Hou Ling-Xiao Zhao Zong Wang Ya-Dong Gu Fan Zhang Zhi-An Ren Gen-Fu Chen Ning Hao Lei Shan Beijing Academy of Quantum Information Sciences Beijing 100193China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China Information Materials and Intelligent Sensing Laboratory of Anhui Province Institute of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Anhui University) Ministry of EducationHefei 230601China Center of Free Electron Laser&High Magnetic Field Anhui UniversityHefei 230601China Songshan Lake Materials Laboratory Dongguan 523808China

The origin of superconductivity observed at the point contact between the normal metal tip and the topological material remains uncertain due to the potential presence of superconducting elements or allotropes *** is imperative to seek out a topological material entirely free of superconducting impurities and induce superconductivity between it and normal tips to verify the source of the induced ***,we report the observation of superconductivity up to 9 K induced at point contacts between normal metal tips and the topological material grey arsenic,which is free of *** determined temperature dependencies of superconducting gapsΔ(T)deviate from the Bardeen-Cooper-Schriefer(BCS)superconductivity law,exhibiting abnormal ***,the highly anisotropic upper critical field H_(c2)(T)suggests the anisotropy of the projected interfacial Fermi *** tuning the junction resistance,we obtained a negative correlation between the superconducting gapΔand the efective barrier height Z,which validates the interfacial coupling strength as a key factor in the observed tip-induced *** experimental results provide guidance for the relevant theory about tip-induced superconductivity on topological materials.

关键词： tip-induced superconductivity topological material interfacial superconductivity grey as

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