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Enhancement of the lower critical field in FeSe-coated Nb structures for superconducting radio-frequency applications
Superconductor Science and Technology ( IF 3.7 ) Pub Date : 2020-11-13 , DOI: 10.1088/1361-6668/abc568
Zefeng Lin 1, 2 , Mingyang Qin 1, 2 , Dong Li 1, 2 , Peipei Shen 1, 2 , Liping Zhang 3 , Zhongpei Feng 4 , Peng Sha 5 , Jun Miao 3 , Jie Yuan 1, 6 , Xiaoli Dong 1, 2, 4 , Chao Dong 5 , Qing Qin 7 , Kui Jin 1, 4, 6
Affiliation  

Bulk Nb superconducting radio-frequency (SRF) cavities are widely used in accelerators, and their accelerating gradient and general performance are limited by the superheating field (B sh). To push the theoretical limit of the B sh, new multilayer structures are required. We fabricated FeSe-coated Nb films using pulsed laser deposition, performed structural characterizations, and measured the transport and magnetic properties for this superconductor-superconductor bilayer structure with smooth surface. Additionally, the measured B c1 of FeSe-coated Nb film is greatly enhanced, while the B sh of the FeSe layer is expected to be higher than that of bulk Nb, yet the superconducting transition temperature (T c) is less than 5 K. This work presents the first fabrication of a new coating layer: FeSe deposited on Nb, showing the possibility of using iron-based materials for multilayer structures in SRF cavities.



中文翻译:

FeSe涂层Nb结构中用于超导射频应用的下临界场的增强

块状Nb超导射频(SRF)腔已广泛用于加速器中,其加速梯度和总体性能受到过热场(B sh)的限制。为了突破B sh的理论极限,需要新的多层结构。我们使用脉冲激光沉积技术制备了FeSe涂层的Nb薄膜,进行了结构表征,并测量了具有光滑表面的超导体-超导体双层结构的输运和磁性。此外,FeSe涂层的Nb薄膜的测得的B c1大大提高,而B shFeSe层的Nb有望高于块状Nb,但超导转变温度(T c)小于5K。这项工作提出了一种新涂层的首次制造方法:FeSe沉积在Nb上,表明了可能性SRF腔体中的多层结构使用铁基材料的研究。

更新日期:2020-11-13
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