A1 Refereed original research article in a scientific journal

The Angular Dependence of the Critical Current of BaCeO3 Doped YBa2Cu3O6+x Thin Films




AuthorsMalmivirta M, Yao LD, Inkinen S, Huhtinen H, Palonen H, Jha R, Awana VPS, van Dijken S, Paturi P

PublisherIEEE-INST Electrical Electronics Engineers INC

Publication year2015

JournalIEEE Transactions on Applied Superconductivity

Journal name in sourceIEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY

Journal acronymIEEE Trans Appl Supercond

Article numberARTN 6603305

Volume25

Issue3

Number of pages5

ISSN1051-8223

DOIhttps://doi.org/10.1109/TASC.2014.2376037


Abstract

The angular dependencies of the critical current of BaCeO3 (BCO) doped YBa2Cu3O6+x (YBCO) thin films grown with pulsed laser deposition (PLD) on SrTiO3 (001) were systematically investigated. The BCO concentration in the YBCO matrix was varied between 0-8 wt.%. Transmission electron microscopy confirmed that the 4% BCO containing sample has point-like, partly agglomerated BCO particles with diameter of 2.5 nm. The dopant degrades the crystal quality of YBCO but improves its in-field current carrying performance especially at low temperatures. The BCO addition affects the angular dependence of the critical current by broadening the B parallel to ab-axis peak of YCBO but no c-axis peak is seen, which is contrary to BaZrO3 doped films made by PLD. Although the particles are point-like, it is found that a model featuring only isotropic pinning centers is not sufficient to describe the angular dependence of the samples where B parallel to ab-axis of YCBO.



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