低温稳定化$\delta$-NbN超导薄膜：通过能量选择性离子束溅射
Low-Temperature Stabilization of $δ$-NbN Superconducting Thin Films through Energy-Selective Ion Beam Sputtering
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中文总结 AI 辅助
本文提出一种室温磁控溅射法，利用能量选择性离子源独立控制离子能量与通量，在低温下稳定高质量δ-NbN超导薄膜，显著收窄超导转变宽度，为量子材料制备提供新范式。
中文摘要 AI 辅助
在低温下制备高质量超导薄膜是可扩展量子器件集成和互补金属氧化物半导体（CMOS）兼容制造的核心挑战。在此，我们展示了一种室温磁控溅射方法，用于合成氮化铌（NbN）薄膜，该方法采用新型能量选择性离子源，能够独立控制离子能量和离子通量。这一能力为精确调控表面动力学和结晶路径提供了有力途径，克服了在降低温度下稳定高质量NbN的长期限制。所得薄膜通过超导输运测量、X射线衍射、X射线光电子能谱和透射电子显微镜进行了表征。与传统反应溅射相比，离子束辅助生长在超导转变温度处实现了转变宽度的显著收窄，表明相纯度和电子均匀性得到改善。此外，这项工作引入了能量选择性离子控制作为一种通用的非平衡路径，用于在低温下稳定亚稳超导相，为薄膜量子材料提供了新的设计范式。
英文摘要
Achieving high-quality superconducting thin films at low temperatures is a central challenge for scalable quantum device integration and Complementary Metal-Oxide-Semiconductor (CMOS)-compatible fabrication. Here, we demonstrate a room-temperature magnetron sputtering approach for synthesizing niobium nitride (NbN) thin films using a novel energy-selective ion source that enables independent control of ion energy and ion flux. This capability provides a powerful route to precisely tailor surface kinetics and crystallization pathways, overcoming longstanding limitations in stabilizing high-quality NbN at reduced temperatures. The resulting films were characterized by superconducting transport measurements, X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. Compared with conventional reactive sputtering, ion beam-assisted growth yields a substantial narrowing of the transition width at the superconducting temperature, indicating improved phase purity and electronic homogeneity. Furthermore, this work introduces energy-selective ion control as a general, non-equilibrium route to stabilize metastable superconducting phases at low temperatures, offering a new design paradigm for thin-film quantum materials.
发表机构
- Michigan State University（密歇根州立大学）
- Princeton University（普林斯顿大学）
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