Optimization for epitaxial fabrication of infinite-layer nickelate superconductors  

作　　者：Minghui Xu Yan Zhao Xiang Ding Huaqian Leng Shu Zhang Jie Gong Haiyan Xiao Xiaotao Zu Huiqian Luo Ke-Jin Zhou Bing Huang Liang Qiao 

机构地区：[1]School of Physics,University of Electronic Science and Technology of China,Chengdu 610054,China [2]Beijing Computational Science Research Center,Beijing 100193,China [3]Diamond Light Source,Harwell Campus,Didcot OX110DE,United Kingdom [4]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [5]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Frontiers of physics》2024年第3期61-69,共9页物理学前沿（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.12274061,52072059,and 11774044);the Science and Technology Department of Sichuan Province(Grant Nos.2021JDJQ0015 and 2022ZYD0014);B.H.acknowledges the support by the National Natural Science Foundation of China(No.2230402).

摘　　要：The discovery of nickelates superconductor creates exciting opportunities to unconventional superconductivity. However, its synthesis is challenging and only a few groups worldwide can obtain samples with zero-resistance. This problem becomes the major barrier for this field. From plume dynamics perspective, we found the synthesis of superconducting nickelates is a complex process and the challenge is twofold, i.e., how to stabilize an ideal infinite-layer structure Nd_(0.8)Sr_(0.2)NiO_(2), and then how to make Nd_(0.8)Sr_(0.2)NiO_(2) superconducting? The competition between perovskite Nd_(0.8)Sr_(0.2)NiO_(3) and Ruddlesden−Popper defect phase is crucial for obtaining infinite-layer structure. Due to inequivalent angular distributions of condensate during laser ablation, the laser energy density is critical to obtain phase-pure Nd_(0.8)Sr_(0.2)NiO_(3). However, for obtaining superconductivity, both laser energy density and substrate temperature are very important. We also demonstrate the superconducting Nd_(0.8)Sr_(0.2)NiO_(2) epitaxial film is very stable in ambient conditions up to 512 days. Our results provide important insights for fabrication of superconducting infinite-layer nickelates towards future device applications.

关 键 词：nickelate superconductivity infinite-layer plasma condensate plume dynamics 

分 类 号：O76[理学—晶体学]