Effect of Irradiation with ¹³²Xe²⁷⁺ Ions at Different Angles on the Critical Parameters of Second-Generation HTSC Tapes Based on GdBa₂Cu₃O_7–x

The effect of ¹³²Xe²⁷⁺ ion (167 MeV) irradiation at angles of 20°, 30°, 60°, and 90° to the tape surface is studied. The critical parameters of the second-generation superconducting tapes are explored. The tapes on the based of the GdBa₂Cu₃O_{7 – x} compound are produced by SuperOx. The critical current (I_c) at 77 K in self magnetic field and the critical temperature (T_c) are plotted as a functions of ion irradiation fluence at different irradiation angles. A minor (up to ~5%) increase in the critical current of high-temperature superconducting (HTSC) tapes is observed for all studied irradiation angles for fluences in a range from 3.4 × 10⁸ to 5 × 10⁹ ions/cm². The radiation resistance of the superconductor to ion irradiation is determined as a function of the irradiation angle. The threshold irradiation fluence Φ_th is measured to determine the radiation resistance of the tape. This is the value at which the critical current approaches zero. The dependence of Φ_th on the irradiation angle α can be approximated by the formula \({{\Phi }_{{{\text{th}}}}} = {{\Phi }_{0}} + A\exp ({{ - \alpha } \mathord{\left/ {\vphantom {{ - \alpha } t}} \right. \kern-0em} t})\) .