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NQR of Cu in YBa 2 Cu 3 O 6.95  was investigated before and after low-temperature electron irradiation as well as after annealing at several distinct temperatures up to 440 K. Irradiation with 2.76 MeV electrons (fluence ϕt = 2.2 · 10 23  e - /m 2) decreased the critical temperature T c  from 91.8 K to 89.5 K. The NQR spectra indicate that the e -  irradiation displaces so-called 0 (4) atoms in the Cu - O chains. It is argued that this results in a modification of the average valence of the Cu(2) atoms in the planes, which explains the reduction of T c . Recovery of the radiation damage sets in (presumably due to the onset of mobility of displaced oxygen atoms) during annealing at 300 K but was still incomplete at 440 K.

Nuclear Quadrupole Resonance Study of Copper in Electron-Irradiated YBa 2 Cu 3 O 6.95