Half-integer Shapiro steps in MgB2 focused He ion beam Josephson junctions

doi:10.1088/1674-1056/ad4d62

中国物理B ›› 2024, Vol. 33 ›› Issue (8): 87404-087404.doi: 10.1088/1674-1056/ad4d62

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

收稿日期:2024-02-17 修回日期:2024-05-15 出版日期:2024-08-15 发布日期:2024-07-15
通讯作者: Xinwei Cai, Yan Zhang E-mail:xwcai@pku.edu.cn;zhang_yan@pku.edu.cn
基金资助:
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).

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

Received:2024-02-17 Revised:2024-05-15 Online:2024-08-15 Published:2024-07-15
Contact: Xinwei Cai, Yan Zhang E-mail:xwcai@pku.edu.cn;zhang_yan@pku.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: Josephson junction, half-integer Shapiro steps, MgB$_2$, focused helium ion beam

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.

Key words: Josephson junction, half-integer Shapiro steps, MgB$_2$, focused helium ion beam

中图分类号: (Superconducting films and low-dimensional structures)

74.78.-w

03.75.Lm (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations) 41.85.Ar (Particle beam extraction, beam injection)

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[J]. 中国物理B, 2024, 33(8): 87404-087404.

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Half-integer Shapiro steps in MgB₂ focused He ion beam Josephson junctions

Half-integer Shapiro steps in MgB₂ focused He ion beam Josephson junctions

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