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)

Fardis, M; Diamantopoulos, G; Karayianni, M; Papavassiliou, G; Tangoulis, V; Konsta, A

dc.contributor.author	Fardis, M	en
dc.contributor.author	Diamantopoulos, G	en
dc.contributor.author	Karayianni, M	en
dc.contributor.author	Papavassiliou, G	en
dc.contributor.author	Tangoulis, V	en
dc.contributor.author	Konsta, A	en
dc.date.accessioned	2014-03-01T01:52:05Z
dc.date.available	2014-03-01T01:52:05Z
dc.date.issued	2002	en
dc.identifier.issn	1098-0121	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26557
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	SUSCEPTIBILITY	en
dc.subject.other	RELAXATION	en
dc.subject.other	MAGNETS	en
dc.subject.other	COMPLEX	en
dc.subject.other	ANTIFERROMAGNETS	en
dc.subject.other	TEMPERATURE	en
dc.subject.other	MOSSBAUER	en
dc.subject.other	LATTICE	en
dc.subject.other	SALTS	en
dc.subject.other	RINGS	en
dc.title	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
heal.type	journalArticle	en
heal.identifier.secondary	014412	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	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
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	PHYSICAL REVIEW B	en
dc.identifier.isi	ISI:000173186000082	en
dc.identifier.volume	65	en
dc.identifier.issue	1	en