Addition of alternate phase nanoparticle dispersions to enhance flux pinning of Y-Ba-Cu-O thin films

Nanoparticle dispersions of various phases were added to YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO or 123) thin films by multilayer pulsed laser deposition, to determine their effect on flux pinning. The different pinning materials examined include Y/sub 2/BaCuO/sub 5/ (Y211 or green-phase), La/sub 2/BaCu...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.3770-3773
Hauptverfasser:	Haugan, T.J., Barnes, P.N., Campbell, T.A., Evans, J.M., Kell, J.W., Brunke, L.B., Murphy, J.P., Varanasi, C., Maartense, I., Wong-Ng, W., Cook, L.P.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences COMPOSITES Dispersion Dispersions Electronics Exact sciences and technology FLUX PINNING FLUXES high temperature superconductor Microelectronic fabrication (materials and surfaces technology) MICROSTRUCTURES Nanocomposites Nanomaterials nanoparticle Nanostructure Nonhomogeneous media Optical materials Optical pulses PARTICLES PINNING Pulsed laser deposition Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Sputtering Superconducting films SUPERCONDUCTORS THIN FILMS Transistors YBCO superconductors Yttrium barium copper oxide YTTRIUM OXIDE
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Zusammenfassung:	Nanoparticle dispersions of various phases were added to YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO or 123) thin films by multilayer pulsed laser deposition, to determine their effect on flux pinning. The different pinning materials examined include Y/sub 2/BaCuO/sub 5/ (Y211 or green-phase), La/sub 2/BaCuO/sub 5/ (La211 or brown-phase), Y/sub 2/O/sub 3/, CeO/sub 2/, and MgO, with lattice constant mismatches varying from 0.5% to 12% with respect to YBCO. Y211 and Y/sub 2/O/sub 3/ provided significant pinning increases at temperatures of 65 K and 77 K, however other phases provided enhancements only at 65 K (for CeO/sub 2/ and La211) for limited range of applied field strengths. An interesting correlation between T/sub c/ transition widths and pinning strengths was observed. The additions produced markedly different nanoparticle and film microstructures, as well as superconducting properties.
ISSN:	1051-8223 1558-2515
DOI:	10.1109/TASC.2005.849427