Abstract
NMR line shifts and spin-lattice relaxation rates of89Y and63Cu in YBa2Cu3O6.9 were measured in disordered samples irradiated by fast neutrons with a fluence of: ϕ=5·1018 cm−2 (T c ons =70 K), ϕ=1.2·1019 cm−2 (T c ons =20 K), in order to investigate the evolution of spin susceptibility χS under irradiation. According to the data obtained, χS decreases markedly as structural disorder accumulates in the samples. The variation of χS is related closely to that observed in oxygen-depleted YBa2Cu3O7−δ compounds with nearly the sameT c value. The data for yttrium display some features that are absent in oxygen-depleted samples. The different temperature dependence of the89Y and63Cu Knight shifts and the increase of the89Y spin-lattice relaxation rate in irradiated samples are discussed in terms of the electron localization effects arising in the CuO2 planes due to the radiation-induced structural disorder.
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