Enhancement of the critical current density in HTSC ceramics by laser radiation

The experimental data on the application of laser radiation to melting YBCO(123) and Bi(2223) high-temperature superconducting ceramics aimed at the improvement of their structure and an increase in the critical current density are systematised. The short-term melting of this ceramics by CO2 laser radiation and the subsequent annealing lead to the formation of a dense fine-grained structure. As a result, the critical current density significantly increases. The best results are obtained for the Bi(2223) ceramics: the critical current density increases by a factor of 40 and 8 at T = 20 K and 77 K, respectively.