Hybrid Nb/Al/Ba0.5K0.5Fe2As2 sandwich Josephson junctions

Hybrid Nb/Al/Ba0.5K0.5Fe2As2 sandwich Josephson junctions
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混合 Nb/Al/Ba0.5K0.5Fe2As2 夹层约瑟夫森结

DOI:
10.1088/1361-6668/ab601f
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发表时间:
2020-01
影响因子:
3.6
通讯作者:
Wu Peiheng
Wu Peiheng
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Tian Wanghao;Lv Yangyang;Xu Zuyu;Zhang Huili;Chen Shixian;Dong Sining;Li Jun;Wang Yong-Lei;Koelle Dieter;Kleiner Reinhold;Wang Huabing;Wu Peiheng

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我们在Ba0.5K0.5Fe2As2(BKFA)单晶和以正常金属Al为势垒的传统超导体Nb之间制备了杂化约瑟夫森结。采用原位法制备了干净的BKFA/Al/Nb界面。目前的输送是沿着BKFA的c轴进行的。电流-电压特性在低温下略有滞后。除某些共振模式外,电流-电压特性的形状可以用阻容分流结模型很好地描述,在低温下,约瑟夫森临界电流与结的正常态电阻的乘积超过180μV。当温度降至2K时,约瑟夫森电流与温度呈线性关系。在40 GHz微波辐照下,观察到整数个夏皮罗台阶。Shapiro阶跃高度的功率依赖关系与RCSJ模拟结果符合得很好。讨论了我们的数据与BKFA超导序参数对称性的可能关系。
We fabricated hybrid Josephson junctions between a Ba0.5K0.5Fe2As2 (BKFA) single crystal and the conventional superconductor Nb with normal metal Al as the barrier. An in situ process was used to create clean BKFA/Al/Nb interfaces. Current transport is along the c-axis of BKFA. The current–voltage characteristics are slightly hysteretic at low temperatures. Except for some features indicative of resonant modes the shape of the current–voltage characteristics can be well described by the resistively and capacitvely shunted junction (RCSJ) model, with a product of the Josephson critical current and the normal state resistance of the junction exceeding 180 μV at low temperatures. The temperature dependence of the Josephson current is linear for temperatures down to 2 K. Under 40 GHz microwave irradiation integer Shapiro steps are observed. The power dependence of the Shapiro step-height is in good agreement with RCSJ simulations. Possible relations of our data with the symmetry of the superconducting order parameter of BKFA are discussed.
铁磷族化物超导体中的向列超导态
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发表时间: 2017-12-01
影响因子: 16.6
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影响因子: 8.6
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影响因子: 8.6
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