Deposition-temperature dependence of vortex pinning property in YBa2Cu3O7+BaHfO3 films

Tomoya Horide, Kenta Torigoe, Ryusuke Kita, Ryota Nakamura, Manabu Ishimaru, Satoshi Awaji, Kaname Matsumoto

Research output: Contribution to journalArticle

Abstract

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 413GN/m3 at 40 K, while the Fp,max. for the deposition temperature of 850°C at 77K 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.

Original languageEnglish
Pages (from-to)449-454
Number of pages6
JournalMaterials Transactions
Volume61
Issue number3
DOIs
Publication statusPublished - 2020 Jan 1

Keywords

  • Critical current density
  • Nanorod
  • Thin film
  • Vortex pinning
  • YBaCuO

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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