Abstract
The combination of two methods: Ag substrate decoration and introduction of BZO nano-inclusions has been used in a pulsed laser deposition (PLD) method to increase the critical density (J c ) of YBCO films. The films were deposited on single crystal SrTiO3 (STO) substrates decorated with various architecture of Ag nano-dots. We have studied the diameter and density of Ag nano-dots and their influence on J c of BZO-added YBCO films. We found that 15 laser pulses on the Ag target gives an optimum result in increasing J c in comparison with BZO-doped YBCO films of the same thickness in self-field and low applied magnetic fields. A higher number of laser pulses on the Ag target led to increasing critical current density in high applied magnetic fields only (above 2 T). We have studied films of the thickness from 0.4 μm to 3.8 μm and found that the highest J c at all applied fields investigated is achieved for a 1.2 μm thick film. The transmission electron microscopy clearly shows BZO nano-rods that provide strong c-axis pinning centres in the films.
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Dang, V.S., Mikheenko, P., Sarkar, A. et al. Combination of Ag Substrate Decoration with Introduction of BaZrO3 Nano-Inclusions for Enhancing Critical Current Density of YBa2Cu3O7 Films. J Supercond Nov Magn 24, 505–509 (2011). https://doi.org/10.1007/s10948-010-0981-8
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DOI: https://doi.org/10.1007/s10948-010-0981-8