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We study the role played by the magnetic frustration in the antiferromagneticphase of the organic salt \kappa-(BEDT-TTF)_ 2 Cu [N(CN)_2] Cl. Using thespatially anisotropic triangular Heisenberg model we analyze previous and newperformed NMR experiments. We compute the 1/T_1 relaxation time by means of themodified spin wave theory. The strong suppression of the nuclear relaxationtime observed experimentally under varying pressure and magnetic field isqualitatively well reproduced by the model. Our results suggest the existenceof a close relation between the effects of pressure and magnetic frustration.Comment: 10 pages, 9 figures, to appear in Journal of Phys.: Condens Matte

1/T1nuclear relaxation time of κ-(BEDT–TTF)2Cu[N(CN)2]Cl : effects of magnetic frustration

1/T₁nuclear relaxation time of κ-(BEDT–TTF)₂Cu[N(CN)₂]Cl : effects of magnetic frustration