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<p>This study systematically optimizes the epitaxial growth of CeO<sub>2</sub> buffer layers on IBAD-MgO substrates via multi-channel multi-beam pulsed laser deposition (MC-MB-PLD) to enhance the performance of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> (YBCO) coated conductors. Through parametric control of oxygen pressure (1–15 mTorr), target-substrate distance (30–60&#xa0;mm), laser energy density (0.54–3.02&#xa0;J/cm<sup>2</sup>), laser energy (250–325&#xa0;mJ), and substrate temperature (750–900&#xa0;°C), we determined that: A target-substrate distance of 45&#xa0;mm (within the stable plasma zone) results in atomically smooth CeO₂ films with (002) orientation (RMS roughness: 0.8&#xa0;nm). An optimal oxygen pressure of 10 mTorr combined with a laser energy of 300&#xa0;mJ effectively eliminates a-axis grains and suppresses particulate defects. Substrate temperatures ≥ 850&#xa0;°C achieve pure (002) orientation with in-plane and out-of-plane textures of 4.3° and 2.1°, respectively. YBCO films deposited on optimized CeO₂ buffers exhibit critical currents up to 91 A (J<sub>c</sub> = 4.0 MA/cm<sup>2</sup> at 77&#xa0;K, 0&#xa0;T). Also, this paper prepared an 830-m long Y<sub>1-x</sub>Gd<sub>x</sub>Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> (YGBCO) tape achieves uniform critical currents of 500 A (J<sub>c</sub> = 3.85 MA/cm<sup>2</sup>) with ΔI<sub>c</sub> &lt; 5%, demonstrating the feasibility of MC-MB-PLD for industrial-scale 2G-HTS production.</p>

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Characterization and Performance Analysis of CeO₂ buffer Layer for YBCO Coated Conductors

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Xiang Wu,
  • Linfei Liu,
  • Yijie Li

摘要

This study systematically optimizes the epitaxial growth of CeO2 buffer layers on IBAD-MgO substrates via multi-channel multi-beam pulsed laser deposition (MC-MB-PLD) to enhance the performance of YBa2Cu3O7-δ (YBCO) coated conductors. Through parametric control of oxygen pressure (1–15 mTorr), target-substrate distance (30–60 mm), laser energy density (0.54–3.02 J/cm2), laser energy (250–325 mJ), and substrate temperature (750–900 °C), we determined that: A target-substrate distance of 45 mm (within the stable plasma zone) results in atomically smooth CeO₂ films with (002) orientation (RMS roughness: 0.8 nm). An optimal oxygen pressure of 10 mTorr combined with a laser energy of 300 mJ effectively eliminates a-axis grains and suppresses particulate defects. Substrate temperatures ≥ 850 °C achieve pure (002) orientation with in-plane and out-of-plane textures of 4.3° and 2.1°, respectively. YBCO films deposited on optimized CeO₂ buffers exhibit critical currents up to 91 A (Jc = 4.0 MA/cm2 at 77 K, 0 T). Also, this paper prepared an 830-m long Y1-xGdxBa2Cu3O7-δ (YGBCO) tape achieves uniform critical currents of 500 A (Jc = 3.85 MA/cm2) with ΔIc < 5%, demonstrating the feasibility of MC-MB-PLD for industrial-scale 2G-HTS production.