Effect of Energy-Dependent Proton Irradiation on Thin-Film YBCO-1237 Superconductor

We investigated the effect of proton irradiations (0.6 MeV and 1.7 MeV) on the superconducting and normal-state properties of thin-film YBCO-1237 superconductors (Tc = 90 K) and found that the relationship between the critical temperature and dimensionless scattering rate obtained during proton irradiation approximates the generalized d-wave Abrikosov–Gor'kov theory better than the previous reports obtained from electron irradiations. This was unexpected since electron irradiation is generally thought to be more effective than proton and other heavier ion irradiations at suppressing superconductivity. The details of experimental setup and results will be presented.