Effects of high-energy proton irradiation on the superconducting properties of Fe(Se,Te) thin films
Effects of high-energy proton irradiation on the superconducting properties of Fe(Se,Te) thin films
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DOI：
10.1088/1361-6668/aab3bd
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发表时间：
2018-05-01
影响因子：
3.6
通讯作者：
Braccini, V.
中科院分区：
文献类型：
--
作者：
Sylva, G.;Bellingeri, E.;Braccini, V.
在本文中，我们探讨了3.5 MeV质子辐照的Fe（Se，Te）薄膜生长在CaF 2上的影响。特别是，我们进行了实验研究，不同的辐照通量高达7.30。10（16）cm（-2）和不同的质子注入深度，以阐明临界电流是否以及在多大程度上被增强或抑制，辐照对临界温度、电阻率和临界磁场的影响，以及最后在这种情况下衬底所起的作用。我们发现，与其他铁基超导体的情况相比，辐照对超导性能的影响通常较小。辐照对临界电流密度J（c）的影响较明显，而对转变温度Tc、正常态电阻率的影响较小，和上临界场H-c2的最高通量在这项工作中探索。更详细地说，我们的分析表明，当质子注入到远离超导膜的衬底，临界电流可以提高到原始值的50%，在7 T和12 K，同时，没有明显的影响，临界温度和临界场一起略有下降的电阻率。相反，当注入层更接近膜-基界面时，临界电流和温度都表现出降低，伴随着电阻率和晶格应变的增强。这一结果表明，可能的修改引起的照射在衬底中可能会影响薄膜的超导性能通过晶格应变。Fe（Se，Te）系统对辐射引起的损伤的鲁棒性使其成为用于制造高能加速器中的磁体的有前途的化合物。
In this paper we explore the effects of 3.5 MeV proton irradiation on Fe(Se, Te) thin films grown on CaF2. In particular, we carry out an experimental investigation with different irradiation fluences up to 7.30 . 10(16) cm(-2) and different proton implantation depths, in order to clarify whether and to what extent the critical current is enhanced or suppressed, what are the effects of irradiation on the critical temperature, resistivity, and critical magnetic fields, and finally what is the role played by the substrate in this context. We find that the effect of irradiation on superconducting properties is generally small compared to the case of other iron-based superconductors. The irradiation effect is more evident on the critical current density J(c), while it is minor on the transition temperature T-c, normal state resistivity., and on the upper critical field H-c2 up to the highest fluences explored in this work. In more detail, our analysis shows that when protons implant in the substrate far from the superconducting film, the critical current can be enhanced up to 50% of the pristine value at 7 T and 12 K; meanwhile, there is no appreciable effect on critical temperature and critical fields together with a slight decrease in resistivity. On the contrary, when the implantation layer is closer to the film-substrate interface, both critical current and temperature show a decrease accompanied by an enhancement of the resistivity and lattice strain. This result evidences that possible modifications induced by irradiation in the substrate may affect the superconducting properties of the film via lattice strain. The robustness of the Fe(Se, Te) system to irradiation-induced damage makes it a promising compound for the fabrication of magnets in high-energy accelerators.