Scholarlink

<p>Current–voltage characterization of YBCO superconductors at 77&#xa0;K (0–1&#xa0;T) confirms a conventional power-law dissipation in sample 1 (<i>n</i> = 6.1–4.2), while revealing unique abrupt voltage jumps in sample 2 with an anomalous <i>n</i> = 3824 at 0.05&#xa0;T. The latter exhibits distinctive field resilience: invariant critical current (0.63 A, <i>J</i><sub><i>c</i></sub> = 1.34 MA/cm<sup>2</sup>) below 0.05&#xa0;T. Microscopic characterization shows that the surface particle dispersion distance of sample 2 is about 200&#xa0;nm, and the high uniformity combined with deep pinning potential barriers effectively suppresses a magnetic flux slip dissipation. Sample 1 exhibits a grain branching structure, and although the pinning force density of 1.9 GN/m<sup>3</sup> is higher than that of sample 2 at 1&#xa0;T, both samples exhibit approximately 80% <i>J</i><sub><i>c</i></sub> attenuation under this magnetic field strength. The steep transition and constant current characteristics of sample 2 provide a new path for ~ 0.05&#xa0;T precision superconducting devices.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on Ic Attenuation of YBCO Film Under Low Magnetic Field Using Electric Transport Method

  • 期刊论文

  • 发表日期：

    2025年7月9日

查看全文
  • Yingnan Li,
  • Fenghua Li,
  • Wenli Pei,
  • Mingyang Zheng,
  • Junjie Yan

摘要

Current–voltage characterization of YBCO superconductors at 77 K (0–1 T) confirms a conventional power-law dissipation in sample 1 (n = 6.1–4.2), while revealing unique abrupt voltage jumps in sample 2 with an anomalous n = 3824 at 0.05 T. The latter exhibits distinctive field resilience: invariant critical current (0.63 A, Jc = 1.34 MA/cm2) below 0.05 T. Microscopic characterization shows that the surface particle dispersion distance of sample 2 is about 200 nm, and the high uniformity combined with deep pinning potential barriers effectively suppresses a magnetic flux slip dissipation. Sample 1 exhibits a grain branching structure, and although the pinning force density of 1.9 GN/m3 is higher than that of sample 2 at 1 T, both samples exhibit approximately 80% Jc attenuation under this magnetic field strength. The steep transition and constant current characteristics of sample 2 provide a new path for ~ 0.05 T precision superconducting devices.