Abstract
Several high-quality single crystals of the superconductor Bi 2Sr 2CaCu 2O 8 (Bi-2212) were exposed to three different neutron fluences in the central irradiation facility of the Triga Mark II reactor in Vienna in the form of pre-prepared and pre-characterized transmission electron microscopy (TEM) samples as well as in full crystalline form. We find that the radiation damage produced in Bi-2212 is very similar to that found previously in YBa 2Cu 3O 7− δ (Y-123) single crystals. The diameter of the amorphous cascade volume is 3.5 nm, the inwardly directed strain field is of approximately the same size, the density of cascades is 3.7×10 22 m −3 per 10 22 neutrons m −2 ( E>0.1 MeV) and their concentration scales linearly with neutron fluence. Based on these results and in view of the similar displacement cross-sections of the constituents of other high temperature superconductors, we conclude that the neutron-induced defects in high- T c materials will generally have a diameter (including the strain field) of 5–7 nm.
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