Half-integer Shapiro steps in strong ferromagnetic Josephson junctions
Half-integer Shapiro steps in strong ferromagnetic Josephson junctions
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DOI：
10.1103/physrevb.104.104414
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发表时间：
2021-09
影响因子：
3.7
通讯作者：
Yunyan Yao;Ranran Cai;See-Hun Yang;Wenyu Xing;Yang Ma;M. Mori;Yuan Ji;S. Maekawa;Xingwang Xie;W. Han
中科院分区：
文献类型：
--
作者：
Yunyan Yao;Ranran Cai;See-Hun Yang;Wenyu Xing;Yang Ma;M. Mori;Yuan Ji;S. Maekawa;Xingwang Xie;W. Han
通过研究射频微波激励下强铁磁约瑟夫森结(Nb-NiFe-Nb)的电流-相位关系，实验观察到了半整数Shapiro台阶。半整数夏皮罗台阶在T=4到7K的宽温度范围内是健壮的。半整数夏皮罗台阶可以归因于强铁磁性NiFe约瑟夫森结中0态和π态的共存。
We report the experimental observation of half-integer Shapiro steps in the strong ferromagnetic Josephson junction (Nb-NiFe-Nb) by investigating the current-phase relation under radiofrequency microwave excitation. The half-integer Shapiro steps are robust in a wide temperature range from T = 4 to 7 K. The half-integer Shapiro steps could be attributed to co-existence of 0and π-states in the strong ferromagnetic NiFe Josephson junctions with the spatial variation of the