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H-1 NMR investigation of the spin dynamics of the spin-frustrated trinuclear Fe cluster (NH4)[Fe-3(mu(3)-OH)(H2L)(3)(HL)(3)] (H3L = orotic acid)

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H-1 NMR investigation of the spin dynamics of the spin-frustrated trinuclear Fe cluster (NH4)[Fe-3(mu(3)-OH)(H2L)(3)(HL)(3)] (H3L = orotic acid) (EN)
Diamantopoulos, G (EN)
Papavassiliou, G (EN)
Tangoulis, V (EN)
Fardis, M (EN)
Karayianni, M (EN)
Konsta, A (EN)
journalArticle (EN)
2014-03-01T01:52:05Z
2002 (EN)
Proton nuclear-magnetic-resonance (NMR) measurements have been performed in the cluster (NH4)[Fe-3(mu(3)-OH)(H2L)(3)(HL)(3)] (H3L = orotic acid) in order to investigate the electron spin dynamics of the Fe trinuclear unit. The proton NMR spectra and spin-lattice relaxation times T-1 have been measured at temperatures between 3 K and room temperature. The 1/T-1 rate exhibits a broad maximum around 50 K, which is attributed to slow local-field fluctuations of the electronic spin system of the order of the Larmor period associated with magnetic excitations between the discrete low-lying energy levels of the cluster. The observation and relaxation analysis of the 1/T-1 maximum provide an independent measurement of the energy difference between the ground and the first-excited state of the trinuclear unit and corroborated the results of previous static susceptibility measurements. (EN)
Physics, Condensed Matter (EN)
COMPLEX (EN)
TEMPERATURE (EN)
RINGS (EN)
SUSCEPTIBILITY (EN)
RELAXATION (EN)
MOSSBAUER (EN)
LATTICE (EN)
SALTS (EN)
MAGNETS (EN)
ANTIFERROMAGNETS (EN)
PHYSICAL REVIEW B (EN)
English
AMERICAN PHYSICAL SOC (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
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