成膜温度を変化させて作製したYBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>+BaHfO<sub>3</sub>薄膜の磁束ピンニング特性  [in Japanese] Deposition-Temperature Dependence of Vortex Pinning Property in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>+BaHfO<sub>3</sub> Film  [in Japanese]

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Author(s)

    • 堀出 朋哉 Horide Tomoya
    • 九州工業大学大学院工学研究院物質工学研究系 Department of Materials Science and Engineering, Kyushu Institute of Technology
    • 鳥越 健太 Torigoe Kenta
    • 九州工業大学大学院工学府物質工学専攻 Department of Materials Science and Engineering, Kyushu Institute of Technology
    • 喜多 隆介 Kita Ryusuke
    • 静岡大学総合科学技術研究科 Graduate School of Integrated Science and Technology, Shizuoka University
    • 中村 亮太 Nakamura Ryota
    • 九州工業大学大学院工学府物質工学専攻 Department of Materials Science and Engineering, Kyushu Institute of Technology
    • 石丸 学 Ishimaru Manabu
    • 九州工業大学大学院工学研究院物質工学研究系 Department of Materials Science and Engineering, Kyushu Institute of Technology
    • 松本 要 Matsumoto Kaname
    • 九州工業大学大学院工学研究院物質工学研究系 Department of Materials Science and Engineering, Kyushu Institute of Technology

Abstract

<p>Improvement of critical current density (<i>J</i><sub>c</sub>) in magnetic fields is required in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> 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 YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>+BaHfO<sub>3</sub> films to control the nanorod structure, and its influence on <i>J</i><sub>c</sub> was analyzed. The YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>+BaHfO<sub>3</sub> film deposited at 850℃ exhibited pinning force maximum (<i>F</i><sub>p,max</sub>) as high as 413 GN/m<sup>3</sup> at 40 K, while the <i>F</i><sub>p,max</sub> for the deposition temperature of 850℃ at 77 K was smaller than that in the YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>+BaHfO<sub>3</sub> film deposited at 900℃. A critical temperature decreased and matching field increased with decreasing the deposition temperature. Increase in deposition temperature is effective in improving the <i>F</i><sub>p,max</sub> in high temperatures, since the critical temperature and matching field dependences of <i>J</i><sub>c</sub> value dominate the <i>F</i><sub>p,max</sub>. On the other hand, low deposition temperature improves the <i>F</i><sub>p,max</sub> in low temperatures since the <i>F</i><sub>p</sub> shift in accordance with matching field is dominant to the <i>F</i><sub>p,max</sub>. Thus, the deposition temperature should be set in pulsed laser deposition of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> films containing nanorods considering the <i>J</i><sub>c</sub> variation with critical temperature and matching field.</p>

<p>Improvement of critical current density (<i>J</i><sub>c</sub>) in magnetic fields is required in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> 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 YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>+BaHfO<sub>3</sub> films to control the nanorod structure, and its influence on <i>J</i><sub>c</sub> was analyzed. The YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>+BaHfO<sub>3</sub> film deposited at 850℃ exhibited pinning force maximum (<i>F</i><sub>p,max</sub>) as high as 413 GN/m<sup>3</sup> at 40 K, while the <i>F</i><sub>p,max</sub> for the deposition temperature of 850℃ at 77 K was smaller than that in the YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>+BaHfO<sub>3</sub> film deposited at 900℃. A critical temperature decreased and matching field increased with decreasing the deposition temperature. Increase in deposition temperature is effective in improving the <i>F</i><sub>p,max</sub> in high temperatures, since the critical temperature and matching field dependences of <i>J</i><sub>c</sub> value dominate the <i>F</i><sub>p,max</sub>. On the other hand, low deposition temperature improves the <i>F</i><sub>p,max</sub> in low temperatures since the <i>F</i><sub>p</sub> shift in accordance with matching field is dominant to the <i>F</i><sub>p,max</sub>. Thus, the deposition temperature should be set in pulsed laser deposition of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> films containing nanorods considering the <i>J</i><sub>c</sub> variation with critical temperature and matching field.</p>

Journal

  • Journal of the Japan Institute of Metals and Materials

    Journal of the Japan Institute of Metals and Materials 83(9), 320-326, 2019

    The Japan Institute of Metals and Materials

Codes

  • NII Article ID (NAID)
    130007695350
  • NII NACSIS-CAT ID (NCID)
    AN00062446
  • Text Lang
    JPN
  • Article Type
    journal article
  • ISSN
    0021-4876
  • NDL Article ID
    029969475
  • NDL Call No.
    Z17-314
  • Data Source
    NDL  IR  J-STAGE 
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