Optimization for epitaxial fabrication of infinite-layer nickelate superconductors

IF 6.5 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Frontiers of Physics Pub Date : 2023-12-28 DOI:10.1007/s11467-023-1368-1

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

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引用次数: 0

Abstract

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_0.8Sr_0.2NiO₂, and then how to make Nd_0.8Sr_0.2NiO₂ superconducting? The competition between perovskite Nd_0.8Sr_0.2NiO₃ 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_0.8Sr_0.2NiO₃. However, for obtaining superconductivity, both laser energy density and substrate temperature are very important. We also demonstrate the superconducting Nd_0.8Sr_0.2NiO₂ 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.

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优化无限层镍酸盐超导体的外延制造

摘要镍酸盐超导体的发现为实现非传统超导电性创造了令人兴奋的机会。然而，镍酸盐超导体的合成具有挑战性，全世界只有少数研究小组能够获得零电阻样品。这个问题成为这一领域的主要障碍。从羽流动力学的角度来看，我们发现超导镍酸盐的合成是一个复杂的过程，面临两方面的挑战，即如何稳定理想的无限层结构 Nd0.8Sr0.2NiO2，以及如何使 Nd0.8Sr0.2NiO2 超导？包晶 Nd0.8Sr0.2NiO3 与 Ruddlesden-Popper 缺陷相之间的竞争是获得无限层结构的关键。由于激光烧蚀过程中冷凝物的角度分布不相等，激光能量密度对于获得相纯的 Nd0.8Sr0.2NiO3 至关重要。然而，要获得超导性，激光能量密度和衬底温度都非常重要。我们还证明，超导 Nd0.8Sr0.2NiO2 外延薄膜在环境条件下非常稳定，可长达 512 天。我们的研究结果为制造超导无限层镍酸盐提供了重要启示，有助于未来的器件应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Frontiers of Physics PHYSICS, MULTIDISCIPLINARY-

CiteScore

9.20

自引率

9.30%

发文量

898

审稿时长

6-12 weeks

期刊介绍： Frontiers of Physics is an international peer-reviewed journal dedicated to showcasing the latest advancements and significant progress in various research areas within the field of physics. The journal's scope is broad, covering a range of topics that include: Quantum computation and quantum information Atomic, molecular, and optical physics Condensed matter physics, material sciences, and interdisciplinary research Particle, nuclear physics, astrophysics, and cosmology The journal's mission is to highlight frontier achievements, hot topics, and cross-disciplinary points in physics, facilitating communication and idea exchange among physicists both in China and internationally. It serves as a platform for researchers to share their findings and insights, fostering collaboration and innovation across different areas of physics.