Deposition-Temperature Dependence of Vortex Pinning Property in YBa₂Cu₃O₇+BaHfO₃ Films 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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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°C 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°C 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°C. 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> </p><p>This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. <b>83</b> (2019) 320–326.</p>

Journal

  • MATERIALS TRANSACTIONS

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

    The Japan Institute of Metals and Materials

Codes

  • NII Article ID (NAID)
    130007801653
  • NII NACSIS-CAT ID (NCID)
    AA1151294X
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    1345-9678
  • NDL Article ID
    030275414
  • NDL Call No.
    Z53-J286
  • Data Source
    NDL  IR  J-STAGE 
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