Finite superconducting square wire-network based on two-dimensional crystalline Mo_(2)C  

作　　者：Zhen Liu Zi-Xuan Yang Chuan Xu Jia-Ji Zhao Lu-Junyu Wang Yun-Qi Fu Xue-Lei Liang Hui-Ming Cheng Wen-Cai Ren Xiao-Song Wu Ning Kang 刘震;杨子萱;徐川;赵嘉佶;王陆君瑜;富云齐;梁学磊;成会明;任文才;吴孝松;康宁(Key Laboratory for the Physics and Chemistry of Nanodevices,School of Electronics and Center for Carbon-Based Electronics,Peking University,Beijing 100871,China;Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;State Key Laboratory for Artificial Microstructure and Mesoscopic Physics,Frontiers Science Center for Nano-optoelectronics,Peking University,Beijing 100871,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)

机构地区：[1]Key Laboratory for the Physics and Chemistry of Nanodevices,School of Electronics and Center for Carbon-Based Electronics,Peking University,Beijing 100871,China [2]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [3]State Key Laboratory for Artificial Microstructure and Mesoscopic Physics,Frontiers Science Center for Nano-optoelectronics,Peking University,Beijing 100871,China [4]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China

出　　处：《Chinese Physics B》2022年第9期134-140,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11974026,11774005,and 51802314);the National Key Research and Development Program of China(Grant No.2017YFA0303304);Science Foundation of Jihua Laboratory(Grant No.2021B0301030003-03);the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB30000000)。

摘　　要：Superconducting wire-networks are paradigms to study Cooper pairing issues,vortex dynamics and arrangements.Recently,emergent low-dimensional crystalline superconductors were reported in the minimal-disorder limit,providing novel platforms to reveal vortices-related physics.Study on superconducting loops with high-crystallinity is thus currently demanded.Here,we report fabrication and transport measurement of finite square-network based on two-dimensional crystalline superconductor Mo_(2)C.We observe oscillations in the resistance as a function of the magnetic flux through the loops.Resistance dips at both matching field and fractional fillings are revealed.Temperature and current evolutions are carried out in magnetoresistance to study vortex dynamics.The amplitude of oscillation is enhanced due to the interaction between thermally activated vortices and the currents induced in the loops.The driving current reduces the effective activation energy for vortex,giving rise to stronger vortex interaction.Moreover,by the thermally activated vortex creep model,we derive the effective potential barrier for vortex dissipation,which shows well-defined correspondence with structures in magnetoresistance.Our work shows that low-dimensional crystalline superconducting network based on Mo_(2)C possesses pronounced potential in studying the modulation of vortex arrangements and dynamics,paving the way for further investigations on crystalline superconducting network with various configurations.

关 键 词：superconducting wire-network crystalline superconductor vortex dynamics low temperature transport 

分 类 号：O469[理学—凝聚态物理]