中国物理B ›› 2022, Vol. 31 ›› Issue (3): 37404-037404.doi: 10.1088/1674-1056/ac3cb1
Zi-Xi Pei(裴子玺)1,2, Wei-Gui Guo(郭伟贵)1,2, and Xiang-Gang Qiu(邱祥冈)1,2,3,†
Zi-Xi Pei(裴子玺)1,2, Wei-Gui Guo(郭伟贵)1,2, and Xiang-Gang Qiu(邱祥冈)1,2,3,†
摘要: The proximity-coupled superconducting island arrays on a metallic film provide an ideal platform to study the phase transition of vortex states under mutual interactions between the vortex and potential landscape. We have developed a top-down microfabrication process for Nb island arrays on Au film by employing an Al hard mask. A current-induced dynamic vortex Mott transition has been observed under the perpendicular magnetic fields of $f$ magnetic flux quantum per unit cell, which is characterized by a dip-to-peak reversal in differential resistance d$V$/d$I$ vs. $f$ curve with the increasing current. The d$V$/d$I$ vs. $I$ characteristics show a scaling behavior near the magnetic fields of $f= {1}/{2}$ and $f=1$, with the critical exponents $\varepsilon$ of 0.45 and 0.3, respectively, suggesting different universality classes at these two fields.
中图分类号: (Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses))