Dynamic vortex Mott transition in triangular superconducting arrays
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,†
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 3 Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
Abstract 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 magnetic flux quantum per unit cell, which is characterized by a dip-to-peak reversal in differential resistance d/d vs. curve with the increasing current. The d/d vs. characteristics show a scaling behavior near the magnetic fields of and , with the critical exponents of 0.45 and 0.3, respectively, suggesting different universality classes at these two fields.
Fund: X.G.Q. acknowledges the support from the National Natural Science Foundation of China (Grant Nos. 11974412 and 11774400) and the National Key R&D Program of China (Grant Nos. 2017YFA0302903 and 2018YFA0305703).
Zi-Xi Pei(裴子玺), Wei-Gui Guo(郭伟贵), and Xiang-Gang Qiu(邱祥冈) Dynamic vortex Mott transition in triangular superconducting arrays 2022 Chin. Phys. B 31 037404
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