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<p>The vortex dynamics for a high-performance BaZrO<sub>3</sub> doped (Y<sub>0.5</sub>Gd<sub>0.5</sub>)Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> superconducting films are investigated by a dynamic magnetization-relaxation method. The superconducting films have dense columnar defects with density ~ 1.1×10<sup>11</sup>&#xa0;cm<sup>−2</sup>. The dynamic relaxation rates exhibit a complex temperature dependence, indicating the presence of multiple magnetic vortex phase transitions and complex vortex-vortex interactions. Based on the experimental data, a vortex phase diagram has been constructed, which shows a large vortex elastic motion region suggesting strong flux pinning and potential applications of the REBCO films. There seems to be a vortex slush region under magnetic fields less than 2&#xa0;T within the temperature range from 10 to 25&#xa0;K. The investigation on the vortex pinning mechanisms indicates that δ<i>l</i>-pinning takes the key role for the vortex motion in the present REBCO films. Based on the present results, it is believed that introducing strong δ<i>T</i><sub>c</sub>-pinning into REBCO superconducting films is the key to further improving their performance at high temperatures and strong magnetic fields.</p>

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Flux Pinning and Vortex Dynamics in (Y0.5Gd0.5)Ba2Cu3O7-δ Superconducting Film with High-Density BaZrO3 Columnar Defects

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Qingbin Tang,
  • Lubin Wang,
  • Qiankun Lei,
  • He Lin,
  • Xiaolei Yi,
  • Fangtao Li,
  • Chunlei Wang,
  • Yushan Wang,
  • Dongliang Wang,
  • Benhai Yu

摘要

The vortex dynamics for a high-performance BaZrO3 doped (Y0.5Gd0.5)Ba2Cu3O7-δ superconducting films are investigated by a dynamic magnetization-relaxation method. The superconducting films have dense columnar defects with density ~ 1.1×1011 cm−2. The dynamic relaxation rates exhibit a complex temperature dependence, indicating the presence of multiple magnetic vortex phase transitions and complex vortex-vortex interactions. Based on the experimental data, a vortex phase diagram has been constructed, which shows a large vortex elastic motion region suggesting strong flux pinning and potential applications of the REBCO films. There seems to be a vortex slush region under magnetic fields less than 2 T within the temperature range from 10 to 25 K. The investigation on the vortex pinning mechanisms indicates that δl-pinning takes the key role for the vortex motion in the present REBCO films. Based on the present results, it is believed that introducing strong δTc-pinning into REBCO superconducting films is the key to further improving their performance at high temperatures and strong magnetic fields.