Half-integer Shapiro steps in MgB 2 focused He ion beam Josephson junctions von Yin 殷, Dali 大利, Cai 蔡, Xinwei 欣炜, Xu 徐, Tiequan 铁权, Sun 孙, Ruining 瑞宁, Han 韩, Ying 颖, Zhang 张, Yan 焱, Wang 王, Yue 越, Gan 甘, Zizhao 子钊

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