Long-Term Stability and Annealing of Defects in YBa2Cu3O7- ? Thin Films produced with Collimated and Focused Helium Ion Beams
Sprache des Vortragstitels:
Englisch
Original Tagungtitel:
73rd Annual Meeting of the Austrian Physical Society
Sprache des Tagungstitel:
Englisch
Original Kurzfassung:
YBa2Cu3O7?? (YBCO) thin films are modified by low-energy light-ion irradiation employing collimated and focused helium ion (He+) beams and the long-term stability of irradiation-induced defects is investigated. The YBCO film resistance is measured in situ during and after irradiation and modeled. This reveals a strong influence of
sample temperature on the formation and on the stability of the He+ irradiationinduced defects. Thermal annealing experiments are performed to investigate the relaxation of irradiation defects. The activation energy for oxygen diffusion and rearrangement into the YBCO unit cell basal plane is determined. The aging of YBCO thin films that are nanostructured into vortex pinning arrays via focused helium ion
irradiation is investigated by measuring resistivity and critical temperature and commensurability effects in magnetic fields. Interestingly, vortex matching effects do not deteriorate with sample storage time while the film resistivity shows some relaxation.
Acknowledgments
The research was funded by a joint project of the Austrian Science Fund (FWF), grant I4865-N, and the German Research Foundation (DFG), grant KO 1303/16-1. It is based upon work from COST Actions CA21144 (SuperQuMap), CA19140 (FIT4NANO), and CA19108 (Hi-SCALE) supported by COST (European Cooperation in Science and
Technology).
Forschungs-