中国物理B ›› 2025, Vol. 34 ›› Issue (4): 47401-047401.doi: 10.1088/1674-1056/adb26c

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Regulation of superconductivity in Nb thin films induced by interstitial oxygen atoms

Yuchuan Liu(刘钰川)1,2, Ming Yang(杨明)1,2, Yun Fan(范云)1,2, Zulei Xu(徐祖磊)2,3, Yu Wu(吴禹)2, Yixin Liu(刘以鑫)2,3, Wei Peng(彭炜)2,3, Gang Mu(牟刚)2,3,†, and Zhi-Rong Lin(林志荣)1,2,3,‡   

  1. 1 Shanghai University, Shanghai 200444, China;
    2 State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2024-12-12 修回日期:2025-01-14 接受日期:2025-02-05 出版日期:2025-04-15 发布日期:2025-04-15
  • 通讯作者: Gang Mu, Zhi-Rong Lin E-mail:mugang@mail.sim.ac.cn;zrlin@mail.sim.ac.cn
  • 基金资助:
    Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB0670000), the National Key Research and Development Program of China (Grant No. 2023YFB4404904), the Key-Area Research and Development Program of Guangdong Province, China (Grant No. 2020B0303030002), and the Autonomous Deployment Project of State Key Laboratory of Materials for Integrated Circuits (Grant No. SKLJC-Z2024-B04).

Regulation of superconductivity in Nb thin films induced by interstitial oxygen atoms

Yuchuan Liu(刘钰川)1,2, Ming Yang(杨明)1,2, Yun Fan(范云)1,2, Zulei Xu(徐祖磊)2,3, Yu Wu(吴禹)2, Yixin Liu(刘以鑫)2,3, Wei Peng(彭炜)2,3, Gang Mu(牟刚)2,3,†, and Zhi-Rong Lin(林志荣)1,2,3,‡   

  1. 1 Shanghai University, Shanghai 200444, China;
    2 State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2024-12-12 Revised:2025-01-14 Accepted:2025-02-05 Online:2025-04-15 Published:2025-04-15
  • Contact: Gang Mu, Zhi-Rong Lin E-mail:mugang@mail.sim.ac.cn;zrlin@mail.sim.ac.cn
  • Supported by:
    Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB0670000), the National Key Research and Development Program of China (Grant No. 2023YFB4404904), the Key-Area Research and Development Program of Guangdong Province, China (Grant No. 2020B0303030002), and the Autonomous Deployment Project of State Key Laboratory of Materials for Integrated Circuits (Grant No. SKLJC-Z2024-B04).

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摘要： The regulation of superconductivity in thin films can provide important information on low-dimensional superconducting properties, and also has important reference values for the application in superconducting devices. Herein, we report the successful regulation of both the superconductivity and normal-state properties of Nb films in a wide range by the controllable introduction of interstitial oxygen atoms. The lattice parameter is enhanced for an extent as large as 4.4%, and the normal-state resistivity $\rho_{\rm n}$ is tuned for more than 15 times. The slope of upper critical field near $T_{\rm c}$ shows a close correlation with $\rho_{\rm n}$ in a wide range. Importantly, it is found that the suppression of $T_{\rm c}$ by disorder reveals a linear dependence with $\rho_{\rm n}$ in the region with an unchanged crystalline quality, which can be understood based on the picture of three-dimensional ballistic motion.

关键词: Nb film, regulation of superconductivity, upper critical field

Abstract: The regulation of superconductivity in thin films can provide important information on low-dimensional superconducting properties, and also has important reference values for the application in superconducting devices. Herein, we report the successful regulation of both the superconductivity and normal-state properties of Nb films in a wide range by the controllable introduction of interstitial oxygen atoms. The lattice parameter is enhanced for an extent as large as 4.4%, and the normal-state resistivity $\rho_{\rm n}$ is tuned for more than 15 times. The slope of upper critical field near $T_{\rm c}$ shows a close correlation with $\rho_{\rm n}$ in a wide range. Importantly, it is found that the suppression of $T_{\rm c}$ by disorder reveals a linear dependence with $\rho_{\rm n}$ in the region with an unchanged crystalline quality, which can be understood based on the picture of three-dimensional ballistic motion.

Key words: Nb film, regulation of superconductivity, upper critical field

中图分类号:  (Superconducting materials other than cuprates)

  • 74.70.-b
74.78.-w (Superconducting films and low-dimensional structures) 74.25.Op (Mixed states, critical fields, and surface sheaths) 74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition)