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Half-integer Shapiro steps in MgB2 focused He ion beam Josephson junctions |
| Dali Yin(殷大利), Xinwei Cai(蔡欣炜)†, Tiequan Xu(徐铁权), Ruining Sun(孙瑞宁), Ying Han(韩颖), Yan Zhang(张焱)‡, Yue Wang(王越), and Zizhao Gan(甘子钊) |
| Applied Superconductivity Center, State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China |
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Abstract Half-integer microwave induced steps (Shapiro steps) have been observed in many different Josephson junction systems, which have attracted a lot of attention because they signify the deviation of current phase relation (CPR) and uncover many unconventional physical properties. In this article, we first report the discovery of half-integer Shapiro steps in MgB$_2$ focused He ion beam (He-FIB) Josephson junctions. The half-integer steps' dependence on microwave frequency, temperature, microwave power, and magnetic field is also analyzed. We find that the existence of half-integer steps can be controlled by the magnetic field periodically, which is similar to that of high temperature superconductor (HTS) grain boundary junctions, and the similarity of the microstructures between gain boundary junctions and He-FIB junctions is discussed. As a consequence, we mainly attribute the physical origin of half-integer steps in MgB$_2$ He-FIB junctions to the model that a He-FIB junction is analogous to a parallel junctions' array. Our results show that He-FIB technology is a promising platform for researching CPR in junctions made of different superconductors.
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Received: 17 February 2024
Revised: 15 May 2024
Accepted manuscript online:
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PACS:
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74.78.-w
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(Superconducting films and low-dimensional structures)
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03.75.Lm
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(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
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41.85.Ar
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(Particle beam extraction, beam injection)
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| Fund: The work was supported by the National Natural Science Foundation of China (Grant No. 12104016) and the National Key Research and Development Program of China (Grant No. 2020YFF01014706). |
Corresponding Authors:
Xinwei Cai, Yan Zhang
E-mail: xwcai@pku.edu.cn;zhang_yan@pku.edu.cn
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Cite this article:
Dali Yin(殷大利), Xinwei Cai(蔡欣炜), Tiequan Xu(徐铁权), Ruining Sun(孙瑞宁), Ying Han(韩颖), Yan Zhang(张焱), Yue Wang(王越), and Zizhao Gan(甘子钊) Half-integer Shapiro steps in MgB2 focused He ion beam Josephson junctions 2024 Chin. Phys. B 33 087404
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