Fig. 3: Lattice parameter analysis of pristine and 1016 He+ irradiated samples.

a Lattice parameter data extracted from aligned stacks of HAADF images such as those shown in Fig. 2. Each data point represents a different image stack, with the lattice parameter values averaged over about 300 unit cells. Reference lattice parameters for YBCO83 and GdBCO84 have been added as dashed lines. b Standard deviations in lattice parameter for each image.