| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 |
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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 $f$ 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.
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Received: 04 November 2021
Revised: 22 November 2021
Accepted manuscript online: 24 November 2021
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PACS:
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74.25.Uv
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(Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses))
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74.45.+c
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(Proximity effects; Andreev reflection; SN and SNS junctions)
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81.16.Rf
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(Micro- and nanoscale pattern formation)
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| 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). |
Corresponding Authors:
Xiang-Gang Qiu
E-mail: xgqiu@iphy.ac.cn
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Cite this article:
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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