Synergetic effect of 200 MeV Ag ions and Y203 inclusions on critical current density in Y1-xCaxBa2Cu3O7- d thick film Kujur Arpna1, Viswakarma P.N.1, Banerjee Alok2, Kanjilal D.3, Behera D.1,* 1Department of Physics, National Institute of Technology, Rourkela-769 008 2UGC-DAE-CSR Indore Center, University Campus, Khandwa Road, Indore-452 017 3Inter University Accelerator Centre, Aruna Asaf Ali Marg, P.O. Box 10502, New Delhi-110 067 *Corresponding author: e-mail: dhrubananda_behera@yahoo.co.in
Abstract Y1-xCaxBa2Cu3O7-ä (x=0.1)+Y2O3 (10wt.%) composite thick film prepared by diffusion reaction technique is irradiated with 200 MeV Ag ions. Micro Raman reveals the microstructural changes. Beans critical state model was employed to calculate the critical current density estimated from the width of magnetization loops obtained at 40 K. The enhancement of Jc from 1.4×104Acm−2 to 6.7×104 Acm−2 with irradiation upto fluence 5×1011ions-cm−2 in YCaBCO samples is observed indicating that flux pinning increases due to the creation of columnar defects induced by irradiation. Addition of Y203 increases the Jc in the pristine sample to 8.3×104 Acm−2 but decreases with increasing fluence. The insulating inclusions Y2O3 causes Jc increment by the process of flux pinning. Combined effects of inhomegenity and columnar defects due to irradiation have degraded the superconducting volume. The interaction energy between vortex and defects dominate over the pinning energy. Hence the pinning sites are not used effectively and Jc starts decreasing with irradiation. Top Keywords SHI irradiation, Pinning energy, Critical current density. Top |