Synergistic Effects on the Nanostrain in YBCO Films Double-Doped with Positive Mismatch Perovskite (Ba2YNbO6) and Negative Mismatch Perovskite (LaAlO3)

Yan Xu, Hong Li Suo*, Jean-Claude Grivel, Min Liu, Xiaolong Zhang, Yuqi Zhou, Jianhua Liu, Zili Zhang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The synergistic effects of double doping with a positive mismatch perovskite (Ba2YNbO6) and a negative mismatch perovskite (LaAlO3) on the brittle ceramic YBa2Cu3O7-x (YBCO) superconducting films were investigated. The double-doped sample allows a greater doping amount than any single doping, with significantly smaller nanostrain on the c axis, and shows superior superconducting properties. By analyzing the crystal mismatch and establishing a suitable model of the doping effects, it was found that the double doping with the positive mismatch and the negative mismatch dopant cancels the long-range strain but still generates defects around the interface between the YBCO and the dopants, simultaneously. This result reveals a feasible method for solving the problem of degradation and even cracks in the YBCO film due to the excess doping amount. This approach provides a wider compositional space for the design and fabrication of more ingenious pinning structures in the YBCO film for meeting the criteria of specific applications.

Original languageEnglish
JournalCrystal Growth and Design
Volume20
Issue number5
Pages (from-to)3449-3455
ISSN1528-7483
DOIs
Publication statusPublished - 2020

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