Abstract
High temperature spin dynamics in the spin 1 2 linear chain Heisenberg system αCuNSal is investigated on a powdered sample through proton spin lattice relaxation time measurements. The results are interpreted in terms of a one-dimensional spin diffusion process, limited by cutoff effects, which are originated from electron intrachain dipolar interactions, and consequently depend on the orientation and on the magnitude of the magnetic field. Quantitative fit with the experiments is obtained by assuming intrachain dipolar interactions appreciably weaker than those calculated from localized electron spins. The value of the “effective” dipolar interaction obtained from nuclear relaxation results yields a calculated ESR linewidth which is in good agreement with the experimental value.
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