Fluorine and hydrogen ion irradiation in YBaCuO superconductor

Temporal Evolution of Defects and Related Electric Properties in He-Irradiated YBa2Cu3O7−δ Thin Films

“…These results lead to the conclusion that 75 keV He + irradiation of YBCO thin films leads to defects with long-term stability at room temperature. Furthermore, it supports the assertion that beyond a certain defect density, room temperature is not high enough to provide the necessary energy for the complete healing of defects following irradiation [26,27].…”

Modification and nano-patterning of high-Tcsuperconducting thin films by masked ion beam irradiation

“…temperature T c of YBCO films performed ex situ after irradiation revealed also a strong increase of ρ(T) and a decrease of T c with accumulated ion dose [4]. Non-linear increase of YBCO film resistance with irradiation dose was observed also for hydrogen, fluorine and carbon ions of 200 keV energy [5].…”

140 MeV Si-ION IRRADIATION INDUCED Tc ENHANCEMENT IN YBCO THIN FILMS

“…Electronic stopping of the beam is known to cause dynamic annealing of the intrinsic defects as well as defects created during irradiation. 1 In addition, electronic energy loss also creates defects and a threshold S e of 1.5 keV/A is believed to create continuous amorphous tracks in YBCO. 7 However, many authors 8 have shown that defects can still be produced at a S e lower than the threshold value.…”

“…The S e of 0.44 keV/A in the present experiment being less than the threshold S e cannot lead to production of continuous amorphous tracks but can result in atomic size point defects. 1 Coupled with the dynamic annealing of defects, the very low concentration of defects that can result during Si ion irradiation at low fluences is expected to have different effects on the superconducting and normal state properties as compared to extended defects observed in irradiation by higher energy heavy ions like Pb, Xe and Kr. Figure 1 shows the evolution of the temperature dependence of the resistance (normalised at 100 K) characteristics of the YBCO films irradiated with 140 MeV Si ions at various fluences.…”

“…While heavy ions in this energy range produce extended columnar defects, the lighter ions in the same energy range has been shown to produce localized atomic size defects. 1 Although considerable progress has been made in identifying the larger defects clusters and their effects on superconducting properties, very little is known about the properties of individual point defects e.g. single vacancies and interstitials, or oxygen disorder.…”