Improvement of critical current densities in SmBa₂Cu ₃O_y, films with BaHfO₃ nano-rods using low temperature growth technique

We studied growth substrate temperature dependent morphologies of BaHfO₃ (BHO) nano-rods for SmBa₂Cu₃O _y, (SmBCO) films with BHO fabricated by pulsed laser deposition (PLD) method. The morphology of BHO nano-rods within the SmBCO matrix could be controlled by changing substrate temperatures adoping a Low Temperature Growth (LTG) technique. Using the LTG technique, we could fabricate SmBCO films showed c-axis orientation even at low substrate temperature during deposition without a degradation of superconducting properties, which is one of the most advantages of the LTG technique. In this study, we found an optimal morphology of the BHO nano-rods and the morphology was fine, straight and various growth directions. The BHO nano-rods were more effective to improve the J_c in a magnetic field than other morphologies of the BHO nano-rods.