Abstract:
The original research results for thin disordered HTSC films based on YBCO are presented in this article. Several experiments have been carried out to confirm a theoretical prediction that the $s$-phase of superconducting pairing in disordered $d$-type superconductors can occur with a gradual decrease in the mean free path. The YBa$_{2}$Cu$_{3}$O$_{7-x}$ films were used as samples which possess a $d$-type of superconducting state that was experimentally confirmed. A gradual decrease in the mean free path was achieved by both thermal annealing and ion irradiation. The experiments included measurements of temperature dependence of the London penetration depth $\lambda$ and resistive studies.
Keywords:high-temperature superconductors, thin films, disorder, ion irradiation, thermal annealing, London penetration length, resistive measurements.