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Unique nanostructural features in Fe, Mndoped YBCO thin films

AuthorsMeledin, A.; Turner, S.; Cayado, Pablo ; Mundet, Bernat ; Solano, Eduardo; Ricart, Susagna ; Ros, Josep; Puig Molina, Teresa ; Obradors, Xavier ; Tendeloo, G. Van
KeywordsCoated conductor
Issue Date21-Oct-2016
PublisherInstitute of Physics Publishing
CitationSuperconductor Science and Technology 29(12): 125009 (2016)
AbstractAn attempt to grow a thin epitaxial composite film of YBa2Cu3O7-δ (YBCO) with spinel MnFe2O4 (MFO) nanoparticles on a LAO substrate using the CSD approach resulted in a decomposition of the spinel and various doping modes of YBCO with the Fe and Mn cations. These nanostructural effects lead to a lowering of Tc and a slight Jc increase in field. Using a combination of advanced transmission electron microscopy (TEM) techniques such as atomic resolution high-angle annular dark field scanning transmission electron microscopy, energy dispersive X-ray spectroscopy and electron energy-loss spectroscopy we have been able to decipher and characterize the effects of the Fe and Mn doping on the film architecture. The YBaCuFeO5 anion-deficient double perovskite phase was detected in the form of 3D inclusions as well as epitaxially grown lamellas within the YBCO matrix. These nano-inclusions play a positive role as pinning centers responsible for the Jc/Jsf (H) dependency smoothening at high magnetic fields in the YBCO-MFO films with respect to the pristine YBCO films.
Publisher version (URL)http://dx.doi.org/10.1088/0953-2048/29/12/125009
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