We report 1H nuclear magnetic resonance spin-lattice relaxation rates T-11 vs. T at different magnetic field values, for molecular antiferromagnetic (AFM) rings with STotal = 0 singlet ground state. New results in {CsFe8}, {Cr8} and {Fe6} are compared with previous results in {Fe6} and {Fe10}. In all cases a strong enhancement of T 1-1 was observed with a maximum occurring at some temperature T0 which is found to be field dependent. It is shown that the critical enhancement appears to be a robust universal feature in these AFM rings for which a general theory is still lacking.
Critical slowing down of the spin dynamics in antiferromagnetic rings / D. Procissi, B.J. Suh, E. Micotti, A. Lascialfari, Y. Furukawa, F. Borsa. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - 272:Suppl. 1(2004), pp. E741-E742.
Critical slowing down of the spin dynamics in antiferromagnetic rings
A. Lascialfari;
2004
Abstract
We report 1H nuclear magnetic resonance spin-lattice relaxation rates T-11 vs. T at different magnetic field values, for molecular antiferromagnetic (AFM) rings with STotal = 0 singlet ground state. New results in {CsFe8}, {Cr8} and {Fe6} are compared with previous results in {Fe6} and {Fe10}. In all cases a strong enhancement of T 1-1 was observed with a maximum occurring at some temperature T0 which is found to be field dependent. It is shown that the critical enhancement appears to be a robust universal feature in these AFM rings for which a general theory is still lacking.Pubblicazioni consigliate
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