0000000000853731

AUTHOR

C.j. Gómez-garcía

showing 4 related works from this author

1D ferrimagnetism in homometallic chains

1990

The magnetic properties of the cobalt zigzag chain Co(bpy)(NCS)2 (bpy=2,2′‐bipyridine) are discussed on the basis of an Ising‐chain model that takes into account alternating Landé factors. It is emphasized, for the first time, that a homometallic chain containing only one type of site can give rise to a 1D ferrimagneticlike behavior. Juan.J.Borras@uv.es , Eugenio.Coronado@uv.es

Condensed matter physicsPyridinesMagnetic PropertiesUNESCO::FÍSICAGeneral Physics and Astronomychemistry.chemical_elementOne−Dimensional SystemsUltralow TemperatureCobalt Compounds ; Pyridines ; Thiocyanates ; One−Dimensional Systems ; Magnetic Properties ; Ising Model ; Ferrimagnetism ; Ultralow Temperature ; Very Low TemperatureCrystallographyIsing ModelchemistryZigzagChain (algebraic topology):FÍSICA [UNESCO]FerrimagnetismFerrimagnetismVery Low TemperatureCobalt compoundsIsing modelCobalt CompoundsCobaltThiocyanatesJournal of Applied Physics
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Magnetism and EPR spectra of the two‐sublattice manganese chain Mn2(EDTA)⋅9H2O

1990

We report on the magnetic behavior and single‐crystal EPR spectra of the chain complex Mn2(EDTA)⋅9H2O characterized by two different alternating sites for the manganese ions. Magnetic susceptibility data are indicative of weak antiferromagnetic exchange interactions between the manganese ions, showing a maximum of about 3 K. This behavior can be accurately described on the basis of a Heisenberg chain model that assumes classical spins, giving J/k=−0.72 K and g=2.0. The EPR spectra are typically low dimensional, with an angular dependence of the linewidth of the type (3 cos2 θ−1)n (n=4/3 or 2). Nevertheless, such a behavior cannot be reproduced from a one‐dimensional model with dipolar broad…

MagnetismEdtaExchange InteractionsGeneral Physics and Astronomychemistry.chemical_elementManganeseMagnetic SusceptibilityElectron Spin ResonanceIonlaw.inventionlaw:FÍSICA [UNESCO]AntiferromagnetismHydratesElectron paramagnetic resonanceLine WidthsCondensed matter physicsSpinsUNESCO::FÍSICAManganese ComplexesMagnetic susceptibilityOne−Dimensional CalculationsDipoleElectron Spin Resonance ; Manganese Complexes ; Edta ; Exchange Interactions ; Magnetic Susceptibility ; Line Widths ; One−Dimensional Calculations ; HydrateschemistryCondensed Matter::Strongly Correlated Electrons
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Magnetic exchange interactions in the heteropoly complexes [M4(H2O)2(PW9O34)2]10− [M=Co(II) and Cu(II)]

1990

The magnetic properties of the heteropolyanions [M4(H2O)2(PW9O34)2]10− [M=Co(II) and Cu(II)] down to 4 K are reported. Their individual heteropoly molecules contain a rhomblike arrangement formed by four coplanar MO6 octahedra sharing edges. The magnetic properties support an intramolecular ferromagnetic exchange in the Co(II) tetramer, and antiferromagnetic exchange in the Cu(II) tetramer. These behaviors are discussed assuming anisotropic exchange in the Co(II) compound, and Heisenberg exchange in the Cu(II) compound. Carlos.Gomez@uv.es

Magnetic PropertiesExchange InteractionsGeneral Physics and AstronomyCopper ComplexesAntiferromagnetismTetramerVery Low TemperatureAntiferromagnetismMoleculeAnisotropy:FÍSICA::Química física [UNESCO]Cobalt Complexes ; Copper Complexes ; Heteropolyanions ; Magnetic Properties ; Exchange Interactions ; Ferromagnetism ; Antiferromagnetism ; Anisotropy ; Heisenberg Model ; Ultralow Temperature ; Very Low TemperatureCondensed matter physicsChemistryHeisenberg modelUltralow TemperatureUNESCO::FÍSICA::Química físicaCrystallographyOctahedronFerromagnetismIntramolecular forceFerromagnetismHeisenberg ModelAnisotropyCobalt ComplexesHeteropolyanions
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Mixed‐valence trinuclear manganese clusters : Influence of the electronic transfer on the magnetic properties

1990

The magnetic behavior of mixed‐valence trinuclear clusters d4‐d4‐d5 is discussed on the basis of a model which takes into account valence delocalization and Heisenberg exchange. This model considers the competing effect between the electronic transfer and the localization of the extra electron due to an asymmetry of the triangular entity. The magnetic properties of the mixed‐valence oxo‐centered Mn(II)‐Mn(III)‐Mn(III) complexes formulated as Mn3O(O2CR)6L3 (R=Me, L=pyridine) are discussed on the basis of the developed model, supporting a significant intramolecular electron transfer. A comparison of these results to those previously reported by assuming a valence‐trapped model is given. Carlo…

Valence (chemistry)ChemistryMagnetic Propertiesmedia_common.quotation_subjectUNESCO::FÍSICAExchange InteractionsGeneral Physics and Astronomychemistry.chemical_elementManganeseElectronElectron TransferManganese ComplexesAsymmetryElectron transferCrystallographyDelocalized electronchemistry.chemical_compound:FÍSICA [UNESCO]Intramolecular forcePyridineMixed−Valence CompoundsAtomic ClustersAtomic physicsMixed−Valence Compounds ; Electron Transfer ; Magnetic Properties ; Atomic Clusters ; Manganese Complexes ; Exchange Interactionsmedia_common
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