NMR study of magnetic moments arising in superconducting cuprates under electron/neutron irradiation

The measurements of direct-current magnetic susceptibility and nuclear magnetic resonance (NMR) were performed in the superconducting cuprates YBa2Cu3O6.9 (89Y,63Cu), Tl2Ba2CaCu2O8 (17O,205Tl), irradiated by fast neutrons (E n = 1 MeV) and electrons (E e = 5 MeV). The influence of the radiation-induced structural disorder on the spin susceptibility and magnetic state of atoms in the CuO2 layer is considered. The possible effect onT c of the spin-exchange scattering of carriers by localized moments arising under irradiation was estimated following the Abrikosov-Gorkov approach and its contribution was found to be too small in comparison with the real suppression ofT c under irradiation.