Enhanced self-field critical current density of nano-composite YBa2Cu3O7 thin films grown by pulsed-laser depositionK. Siraj1, J. D. Pedarnig1, A. Moser1, D. Bäuerle1, N. Hari Babu2 and D. A. Cardwell2
1 Institut für Angewandte Physik, Johannes-Kepler-Universität - Linz, A-4040 Linz, Austria, EU
2 Department of Engineering and IRC in Superconductivity, University of Cambridge Trumpington Street, Cambridge, CB2 1PZ, UK, EU
received 2 October 2007; accepted in final form 7 April 2008; published June 2008
published online 27 May 2008
Enhanced self-field critical current density of novel, high-temperature superconducting thin films is reported. Layers are deposited on (001) MgO substrates by laser ablation of YBa2Cu3O(Y-123) ceramics containing Y2Ba4CuMOx (M-2411, M = Ag, Nb, Ru, Zr) nano-particles. The of films depends on the secondary-phase content of the ceramic targets, which was varied between 0 and 15 mol%. Composite layers (2 mol% of Ag-2411 and Nb-2411) exhibit values at 77 K of up to 5.1 MA/cm2, which is 3 to 4 times higher than those observed in films deposited from phase pure Y-123 ceramics. Nb-2411 grows epitaxially in the composite layers and the estimated crystallite size is 10 nm.
74.78.Bz - High-Tc films.
81.15.Fg - Laser deposition.
68.55.Nq - Composition and phase identification.
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