中国物理B ›› 2022, Vol. 31 ›› Issue (9): 97404-097404.doi: 10.1088/1674-1056/ac67c7
Zhen Liu(刘震)1, Zi-Xuan Yang(杨子萱)1, Chuan Xu(徐川)2, Jia-Ji Zhao(赵嘉佶)3, Lu-Junyu Wang(王陆君瑜)3, Yun-Qi Fu(富云齐)1, Xue-Lei Liang(梁学磊)1, Hui-Ming Cheng(成会明)2,4, Wen-Cai Ren(任文才)2,4, Xiao-Song Wu(吴孝松)3, and Ning Kang(康宁)1,†
Zhen Liu(刘震)1, Zi-Xuan Yang(杨子萱)1, Chuan Xu(徐川)2, Jia-Ji Zhao(赵嘉佶)3, Lu-Junyu Wang(王陆君瑜)3, Yun-Qi Fu(富云齐)1, Xue-Lei Liang(梁学磊)1, Hui-Ming Cheng(成会明)2,4, Wen-Cai Ren(任文才)2,4, Xiao-Song Wu(吴孝松)3, and Ning Kang(康宁)1,†
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 Mo2C. 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 Mo2C 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.
中图分类号: (Superconducting films and low-dimensional structures)