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Figure 8. Microstructural characterization of irradiated YBCO/BZO nanocomposite films and the relationship between Jc and magnetic field. (A) Low-magnification microscope image of the sample when the irradiation dose is 1 × 1015proton/cm2, in which the bright patches are BTO nanoparticles and the black spots are smaller irradiation defects. (B) Relationship between the enhancement factor of Jc and the magnetic field of YBCO/BTO nanocomposite films under different irradiation doses and temperatures[108] © 2021 IOP Publishing Ltd. Printed in the UK.