INDUCTANCE MEASUREMENTS OF HTSC FILMS WITH HIGH CRITICAL CURRENTS

Non-destructive inductance measurements of critical currents of thin superconducting YBa2Cu3Ox filMS were carried out. In the framework of the critical state model, an exact analytical solution for current and field patterns on thin superconducting disks possessing pinning and oriented perpendicular to the external magnetic field was found. The problem was solved for both constant and periodically varying external fields. The solution allows one to describe the states of the film in weak field when there are wide regions free of vortices. The theoretical results were used to restore the temperature dependence of critical current density of HTSC films from their diamagnetic response.