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Title

Epitaxial superconducting GdBa2Cu3O7−δ/Gd2O3 nanocomposite thin films from advanced low-fluorine solutions

AuthorsCayado, Pablo ; Mundet, Bernat ; Vallés, Ferran ; Coll, Mariona ; Ricart, Susagna ; Gázquez, Jaume ; Palau, Anna ; Puig Molina, Teresa ; Obradors, Xavier
KeywordsGdBCO
Low-fluorine solution
Nanocomposites
Chemical solution deposition
Flash-heating process
Issue DateDec-2017
PublisherInstitute of Physics Publishing
CitationSuperconductor Science and Technology 30(12): 125010 (2017)
AbstractWe have employed the CSD method to synthesize GdBCO and GdBCO–Gd2O3 nanocomposite 250–300 nm thin films. For this we have designed a new low-fluorine solution never used before in the synthesis of GdBCO thin films that allows us to reduce the HF release by 80% and increase the reproducibility of the pyrolysis process. The growth of these thin films required a new thermal process to be designed, which we refer to as 'flash-heating', where the heating rate is extremely fast (~600 °C min−1). The structure and the superconducting properties of the pristine GdBCO films are excellent, showing a (00 l) epitaxial orientation of the GdBCO grains and T c values that reach 92.8 K, which means an enhancement of more than 1 K with respect to standard YBCO films. The calculated J c inside the grains (${J}_{{\rm{c}}}^{{\rm{G}}}$) also presents remarkable values: ${J}_{{\rm{c}}}^{{\rm{G}}}$(5 K) ~ 40 MA cm−2 and ${J}_{{\rm{c}}}^{{\rm{G}}}$(77 K) ~ 3.3 MA cm−2. Finally, the GdBCO–Gd2O3 nanocomposites films, with a 20% mol of Gd2O3, exhibit superior superconducting properties and pinning performances with respect to GdBCO pristine films.
DescriptionCayado, Pablo et al.
Publisher version (URL)http://dx.doi.org/10.1088/1361-6668/aa8ffe
URIhttp://hdl.handle.net/10261/159836
ISSN0953-2048
Appears in Collections:(ICMAB) Artículos
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