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| Título: | High pinning performance of YBa2Cu3O7-x films added with Y2O3 nanoparticulate defects |
Autor: | Mele, Paolo; Guzmán, Roger CSIC ORCID; Gázquez, Jaume CSIC ORCID; Puig Molina, Teresa CSIC ORCID ; Obradors, Xavier CSIC ORCID; Idries Adam, Malik | Palabras clave: | YBCO films Single vortex dynamics Y2O3 artificial pinning centers Isotropic pinning |
Fecha de publicación: | 24-dic-2014 | Editor: | Institute of Physics Publishing | Citación: | Superconductor Science and Technology 28: 024002 (2015) | Resumen: | © 2015 IOP Publishing Ltd. We report the epitaxial growth and superconducting properties of Y2O3-added YBa2Cu3Ox (YBCO) films grown on SrTiO3-buffered MgO substrates by pulsed-laser deposition using surface-modified YBCO targets. Areas of Y2O3 sectors on the YBCO target were increased to 5.44% and 9.22% of the total YBCO pellet in order to find a correlation between the Y2O3 content, morphology, and the pinning properties of YBCO+Y2O3 mixed films. The maximum global pinning forces, FP, at 77 K were 14.3 GN m-3 and 1.15 GN m-3 for the Y2O3 5.44A% and 9.22A%, respectively. The 5.44A% Y2O3-added sample presents a very high value of pinning force at 77 K, approaching the value obtained in YBCO films with added BaZrO3 nanorods, but with less depression in the superconducting critical temperature, Tc. In accordance with scanning transmission electron microscopy (STEM) observations, both films present nanoparticulate Y2O3 dispersed in a YBCO matrix where Y2Ba4Cu8O16 (Y248) intergrowths were also observed. Consistent with the strong pinning theory, the size and distribution of randomly dispersed Y2O3 particles are optimal for the flux pinning of a 5.44A% Y2O3-YBCO film, while in the case of a 9.22A% film, the YBCO matrix is degraded by jam-packed Y248 intergrowth, which leads to a comparatively poor pinning performance. We further used the single-vortex dynamics model to account for vortex pinning in the samples. The 5.44A% Y2O3-YBCO film result shows good agreement with the model fit up to 4 T of the applied magnetic field. | Descripción: | Mele, Paolo et al. | URI: | http://hdl.handle.net/10261/137678 | DOI: | 10.1088/0953-2048/28/2/024002 | ISSN: | 1361-6668 |
| Aparece en las colecciones: | (ICMAB) Artículos |
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| Mele_SupercondSciTech_2015_postprint.pdf | 1,25 MB | Adobe PDF |  Visualizar/Abrir |
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