The galvanomagnetic properties of thick films under 60Co -irradiation to up to 450kGy were studied. The variations in the resistivity in the normal state, the critical temperature and the critical current density, as well as an increase in the pinning energies, suggested that these property changes were dominated by irradiated-induced randomly distributed O defects. The 3-dimensional collective pinning theory was used to estimate the pinning energies and critical current density. A comparison of the experimental data with theoretical predictions demonstrated the importance of irradiation-induced O defects as effective pinning centers.

A.Leyva, M.Mora, G.Martín, A.Martínez: Semiconductor Science and Technology, 1995, 8[11], 816-21