Deposition-Temperature Dependence of Vortex Pinning Property in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>+BaHfO<sub>3</sub> Films

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  • Horide Tomoya
    Department of Materials Science and Engineering, Kyushu Institute of Technology
  • Torigoe Kenta
    Department of Materials Science and Engineering, Kyushu Institute of Technology
  • Kita Ryusuke
    Graduate School of Integrated Science and Technology, Shizuoka University
  • Nakamura Ryota
    Department of Materials Science and Engineering, Kyushu Institute of Technology
  • Ishimaru Manabu
    Department of Materials Science and Engineering, Kyushu Institute of Technology
  • Awaji Satoshi
    Institute for Materials Research, Tohoku University
  • Matsumoto Kaname
    Department of Materials Science and Engineering, Kyushu Institute of Technology

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  • Deposition-Temperature Dependence of Vortex Pinning Property in YBa₂Cu₃O₇+BaHfO₃ Films

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Abstract

<p>Improvement of critical current density (Jc) in magnetic fields is required in YBa2Cu3O7 films, and process parameters should be optimized for controlling pinning centers. In the present study, a deposition temperature was varied in pulsed laser deposition of YBa2Cu3O7+BaHfO3 films to control the nanorod structure, and its influence on Jc was analyzed. The YBa2Cu3O7+BaHfO3 film deposited at 850°C exhibited pinning force maximum (Fp,max) as high as 413 GN/m3 at 40 K, while the Fp,max for the deposition temperature of 850°C at 77 K was smaller than that in the YBa2Cu3O7+BaHfO3 film deposited at 900°C. A critical temperature decreased and matching field increased with decreasing the deposition temperature. Increase in deposition temperature is effective in improving the Fp,max in high temperatures, since the critical temperature and matching field dependences of Jc value dominate the Fp,max. On the other hand, low deposition temperature improves the Fp,max in low temperatures since the Fp shift in accordance with matching field is dominant to the Fp,max. Thus, the deposition temperature should be set in pulsed laser deposition of YBa2Cu3O7 films containing nanorods considering the Jc variation with critical temperature and matching field.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 83 (2019) 320–326.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 61 (3), 449-454, 2020-03-01

    The Japan Institute of Metals and Materials

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