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.
Molecular antiferromagnetic rings; Nuclear magnetic resonance; Nuclear spin lattice relaxation rate; Spin-spin correlation function
Settore FIS/01 - Fisica Sperimentale
Settore FIS/03 - Fisica della Materia
2004
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/145414
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