Abstract
The structure of radiation defects – tracks is studied in a 1 µm thick YBa2Cu3O6 + δ layer in composite tapes irradiated with Xe and Kr ions with energies in the range 0.1–0.8 MeV/nucleon. It is shown that the irradiation of YBa2Cu3O6 + δ with ions of various energies leads to the creation of continuous (highest ion energies) and discontinuous ion tracks (created by ions with intermediate energies) with an amorphous structure. The density of the material inside the track is almost two times lower than the density of the pristine YBa2Cu3O6 + δ crystal. It has been found that almost spherical fragments of discontinuous tracks with a diameter of about 5 nm are most effective for immobilization of vortex lines and contribute to an increase in the critical current density in magnetic fields up to 9 T in the temperature range 4.2–77 K.
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ACKNOWLEDGMENTS
The authors are grateful to V.A. Skuratov and his colleagues from the Laboratory of Nuclear Reactions for the preparation of irradiated samples, as well as A.V. Troitsky for measuring the critical current as a function of fluences.
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This work was supported by the RF Ministry of Science and Higher Education.
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Suvorova, E.I., Degtyarenko, P.N., Ovcharov, A.V. et al. Influence of the Structure of Ion Tracks in YBCO on the Superconducting Properties of Composite Wires. J. Surf. Investig. 16, 112–117 (2022). https://doi.org/10.1134/S1027451022010360
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DOI: https://doi.org/10.1134/S1027451022010360