Search results for "Ultralow Temperature"

showing 3 items of 3 documents

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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1D antiferromagnetism in spin‐alternating bimetallic chains

1990

The magnetic and thermal properties of the ordered bimetallic chain CoNi(EDTA)⋅6H2O in the very low‐temperature range are reported. The magnetic behavior does not exhibit the characteristic features of 1D ferrimagnets, but a continuous decrease of χmT towards zero at absolute zero. This 1D antiferromagnetic behavior results from an accidental compensation between the moments located at the two sublattices. This behavior, as well as the specific‐heat results, are modeled on the basis of an Ising‐exchange model that considers both alternating spins and Landé factors, and a zero‐field splitting on the Ni site. Eugenio.Coronado@uv.es ; Fernando.Sapina@uv.es

Magnetic PropertiesEdtaExchange InteractionsGeneral Physics and AstronomyNickel CompoundsCobalt Compounds ; Nickel Compounds ; Edta ; Hydrates ; Magnetic Properties ; One−Dimensional Systems ; Ultralow Temperature ; Antiferromagnetism ; Magnetic Moments ; Exchange Interactions ; Ising Model ; Anisotropy ; Specific HeatMagnetic MomentsAntiferromagnetism:FÍSICA [UNESCO]AntiferromagnetismHydratesAnisotropyBimetallic stripAbsolute zeroSpin-½Condensed matter physicsMagnetic momentSpinsChemistryUNESCO::FÍSICAOne−Dimensional SystemsUltralow TemperatureSpecific HeatIsing ModelAnisotropyCondensed Matter::Strongly Correlated ElectronsIsing modelCobalt Compounds
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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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