In magnetic rings of transition-metal ions, electron-spin correlations are found to exhibit rather unusual dynamical features, as a result of a subtle interplay between finite-size effects and magnetic interactions distinctly smaller than the dominant Heisenberg exchange Hamiltonian. These findings, mostly obtained by a mode-coupling approach, are shown to have important consequences on the nuclear-spin (proton) relaxation rates T-1(-1) as measured in two specific rings, comprising six Cu or six Fe ions (respectively, ferromagnetic and antiferromagnetic). In both systems the magnetic-field and temperature dependence of the theoretical results is found to compare rather well with the experimental findings.

Nuclear-spin Relaxation in Magnetic Rings / A., Lascialfari; D., Gatteschi; Cornia, Andrea; U., Balucani; M. G., Pini; A., Rettori. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 57(1998), pp. 1115-1123.

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