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dc.contributor.authorFiloti, George-
dc.contributor.authorKuz'min, M. D.-
dc.contributor.authorBartolomé, Juan-
dc.identifier.citationPhysical Review - Section B - Condensed Matter 74(13): 134420.1-134420.13 (2006)en_US
dc.description13 pages, 8 figures, 3 tables.-- PACS number(s): 75.50.Xx, 76.80.+y, 75.50.Dden_US
dc.description.abstractThe 57Fe Mössbauer spectroscopy on -iron(II) phthalocyanine (FePc) as a function of temperature (1.3<T<295 K) and applied field (0<B<10 T) has been used to study the peculiar magnetic properties of this ferromagnetic quasilinear chain type compound. One sextet with an internal hyperfine field Bint=66.2 T was observed at 1.3 K, a very large value for a bivalent iron with S=1 pointing to the existence of large positive orbital and dipolar contributions in the investigated FePc. Under an applied field, the experimental spectra exhibited two nonequivalent Fe positions, due to spin canting, with the values for the hyperfine fields of the split sextets increasing with increasing field, an indication that unlike most cases, Bint in -FePc is positive, i.e., parallel to the magnetic moment of iron. Therefore, the origin of the large hyperfine field is the orbital moment rather than the Fermi's contact interaction. This fact is ascribed to the orbital degeneracy of the ground state of Fe(II) in the present configuration, where an unpaired hole occupies the orbital doublet (dxz, dyz). This feature supports and explains the magnetization and susceptibility data as well as the anomalously high hyperfine field observed at 57Fe nucleus. The relaxational behavior in the ac susceptibility and Mössbauer spectra found in the region 5–20 K was ascribed to solitonlike motion of domain walls within the magnetic chains, with a single-kink activation energy of 72 K.en_US
dc.description.sponsorshipThis work has been supported by Project No. MAT05/ 1272 of the Spanish Ministry of Education and Science. M. D. Kuz’min acknowledges Grant No. SAB2000-0084. G. F. acknowledges the Royal Society Research Grant at the University of Liverpool and Grant No. SAB2003/0226 from Ministerio de Education, Cultura y Deporte of Spain. The final part of this work was facilitated and supported by EU Network of Excellence MAGMANet.en_US
dc.format.extent278208 bytes-
dc.publisherAmerican Physical Societyen_US
dc.subjectIron compoundsen_US
dc.subjectOrganic compoundsen_US
dc.subjectFerromagnetic materialsen_US
dc.subjectMossbauer effecten_US
dc.subjectHyperfine interactionsen_US
dc.subjectSpin dynamicsen_US
dc.subjectCanted spin arrangementsen_US
dc.subjectMagnetic momentsen_US
dc.subjectGround statesen_US
dc.subjectMagnetic susceptibilityen_US
dc.subjectMagnetic relaxationen_US
dc.subjectMagnetic domain wallsen_US
dc.subjectMolecular magnetismen_US
dc.titleMössbauer study of the hyperfine interactions and spin dynamics in -iron(II) phthalocyanineen_US
dc.description.peerreviewedPeer revieweden_US
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