1H NMR investigation of the spin dynamics of the spin-frustrated trinuclear Fe cluster (NH4)[Fe3(μ3-OH)(H2L)3(HL)3] (H3L=orotic acid)
Creators
- 1. Department of Physics, National Technical University of Athens, 15780 Athens (Greece)
- 2. Department of Materials Science, University of Patras, 26500 Patras (Greece)
- 3. Institute of Materials Science, National Center for Scientific Research 'Demokritos', 15310 Athens (Greece)
Description
Proton nuclear-magnetic-resonance (NMR) measurements have been performed in the cluster (NH4)[Fe3(μ3-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 T1 have been measured at temperatures between 3 K and room temperature. The 1/T1 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/T1 maximum provide an independent measurement of the energy difference between the ground and the first-excited state of the trinuclear unit and corroborates the results of previous static susceptibility measurements
Additional details
Identifiers
Publishing Information
- Journal Title
- Physical Review. B, Condensed Matter and Materials Physics
- Journal Volume
- 65
- Journal Issue
- 1
- Journal Page Range
- p. 014412-014412.6
- ISSN
- 1098-0121
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 35094098
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S36: MATERIALS SCIENCE; S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Descriptors DEI
- EXCITATION; EXCITED STATES; IRON COMPLEXES; MOLECULAR CLUSTERS; NMR SPECTRA; NUCLEAR MAGNETIC RESONANCE; OROTIC ACID; PROTONS; SPIN; SPIN-LATTICE RELAXATION; TEMPERATURE RANGE 0013-0065 K
- Descriptors DEC
- ANGULAR MOMENTUM; AZINES; BARYONS; CARBOXYLIC ACIDS; COMPLEXES; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; FERMIONS; HADRONS; HETEROCYCLIC ACIDS; HETEROCYCLIC COMPOUNDS; HYDROXY COMPOUNDS; MAGNETIC RESONANCE; NUCLEONS; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PARTICLE PROPERTIES; PYRIMIDINES; RELAXATION; RESONANCE; SPECTRA; TEMPERATURE RANGE; TRANSITION ELEMENT COMPLEXES; URACILS
Optional Information
- Notes
- (c) 2001 The American Physical Society