earticle

영어

The BaHfO3 (BHO) buffer layer on the IBAD MgO template was turned to be effective for a successful fabrication of GdBa2Cu3O7-δ (GdBCO) films with high critical current density (Jc). Both the BHO buffer layers and GdBCO films were prepared by pulsed laser deposition (PLD). The effects of the PLD conditions, including substrate temperature (Ts), oxygen partial pressure (PO2), and deposition time on the in-plane texture, surface roughness, and microstructures of the BHO buffer layers on the IBAD MgO template were systematically studied for processing optimization. The c-axis oriented growth of BHO layers was insensitive to the deposition temperature and the film thickness, while the in-plane texture and surface roughness of those were improved with increasing Ts from 700 to 800°C. On the optimally processed BHO buffer layer, the highest Jc value (77 K, self-field) of 3.68 MA/cm2 could be obtained from GdBCO film deposited at 780°C, representing that BHO is a strong candidate for the buffer layer on the IBAD MgO template.