Systematic research on the effect of both positive and negative mismatch dopants in double-doped YBCO superconducting films

Yan Xu, Hongli Suo*, Thomas Qureishy, Jean-Claude Grivel, Pavlo Mikheenko, Min Liu, Lin Ma, Xiaolong Zhang, Yuqi Zhou, Jianhua Liu, Lei Wang, Zili Zhang, Qiuliang Wang

*Corresponding author for this work

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Abstract

We report a novel doping strategy for YBa2Cu3O7-x (YBCO) superconducting films by using a positive mismatch, Ba2YNbO6 (BYNO), and a negative mismatch, LaAlO3 (LAO), simultaneously. Double doping can significantly reduce the c-strain in the YBCO film by canceling the strain between the two dopants. By systematically optimizing the doping amount of both BYNO and LAO, it was found that BYNO and LAO do not act equally. The microstructure and distribution of both BYNO and LAO were investigated with magneto-optic microscopy and scanning electron microscopy. The effect of BYNO and LAO on pinning was confirmed. The results of this study will help select appropriate positive mismatch and negative mismatch dopants, which is fundamental to the design and fabrication of pinning centers to fit different application scenarios.

Original languageEnglish
JournalJournal of the European Ceramic Society
Volume41
Issue number1
Pages (from-to)480-487
ISSN0955-2219
DOIs
Publication statusPublished - 2021

Keywords

  • BYNO
  • Double mismatch
  • LAO
  • MO
  • Pinning center
  • YBCO

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