The transitions within the S=5 ground state of the tetrairon(III) molecular cluster Fe4(OCH3)6(dpm)6 (Hdpm = dipivaloylmethane) have been measured by inelastic neutron scattering. The spectra have been interpreted by means of an effective spin Hamiltonian for an isolated S=5 multiplet, taking into account the presence of three different isomers in the compound. It has been shown that for the two dominant isomers the symmetry of the zero-field splitting tensor is not purely axial, but a nonzero rhombic coefficient E is needed to fit the neutron spectra. The results have been discussed in comparison with recent high-field electron paramagnetic resonance data in single crystals. Heat-capacity measurements in the range 2 to 20 K have been performed and shown to be compatible with the neutron results for the zero-field splitting.
Neutron spectroscopy within the S=5 groud multiplet and low-temperature heat capacity in Fe4 magnetic cluster / Amoretti, G.; Carretta, S.; Caciuffo, R.; Casalta, H.; Cornia, A.; Affronte, Marco; Gatteschi, D.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 64:10(2001), pp. 104403/1-104403/7. [10.1103/PhysRevB.64.104403]
Neutron spectroscopy within the S=5 groud multiplet and low-temperature heat capacity in Fe4 magnetic cluster
CORNIA A.;AFFRONTE, Marco;
2001
Abstract
The transitions within the S=5 ground state of the tetrairon(III) molecular cluster Fe4(OCH3)6(dpm)6 (Hdpm = dipivaloylmethane) have been measured by inelastic neutron scattering. The spectra have been interpreted by means of an effective spin Hamiltonian for an isolated S=5 multiplet, taking into account the presence of three different isomers in the compound. It has been shown that for the two dominant isomers the symmetry of the zero-field splitting tensor is not purely axial, but a nonzero rhombic coefficient E is needed to fit the neutron spectra. The results have been discussed in comparison with recent high-field electron paramagnetic resonance data in single crystals. Heat-capacity measurements in the range 2 to 20 K have been performed and shown to be compatible with the neutron results for the zero-field splitting.
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