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The relaxation of the tunnelling system by conduction electrons in the one-dimensional Hubbard model with defects is considered. One possible application to the high-T c superconductors is proposed. The relaxation rates of the two kinds of defects situated on both the copper and oxygen positions in CuO 2 planes are calculated. It is shown that the tunnelling relaxation of the copper defect deviates from the conventional Korringa-like law.