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Magnetic behaviour of the MTbF6 fluoroterbates (M=Cd, Ca, Sr, (α/β)-Ba)

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierLaboratoire des Matériaux Inorganiques [LMI]
dc.contributor.authorJOSSE, Michaël
hal.structure.identifierEquipe "Matériaux Inorganiques"
dc.contributor.authorEL-GHOZZI, Malika
hal.structure.identifierEquipe "Matériaux Inorganiques"
dc.contributor.authorAVIGNANT, Daniel
hal.structure.identifierLaboratoire Léon Brillouin [LLB - UMR 12]
dc.contributor.authorANDRÉ, Gilles
hal.structure.identifierLaboratoire Léon Brillouin [LLB - UMR 12]
dc.contributor.authorBOURÉE, Françoise
hal.structure.identifierMatériaux, Rayonnements, Structure [NEEL - MRS]
dc.contributor.authorISNARD, Olivier
dc.date.issued2012
dc.identifier.issn0022-4596
dc.description.abstractEnNeutron powder diffraction has been performed on the MTbF6 fluorides (M=Cd, Ca, Sr, (α/β)-Ba). Four of these fluorides (Cd, Ca, Sr, β-Ba) are built of a (pseudo-) tetragonal packing of [TbF6]2− chains and only differs by the chains relative orientations. Thus this series represents a valuable opportunity to evaluate the Tb4+-Tb4+ magnetic interactions. All the compounds displayed antiferromagnetic order (TN=2.70 K (Cd), 2.15 K (Ca), 2.60 K (Sr), 2.10 K (β-Ba)), except for the α form of BaTbF6. The crystal structure of this latter fluoroterbate has also been investigated by means of high-resolution neutron powder diffraction. From Neutron Powder Diffraction data, CdTbF6 and β-BaTbF6 magnetic structures were determined, together with the metamagnetic behaviour of β-BaTbF6 as a function of an external magnetic field. A tentative phase diagram is then given for β-BaTbF6. Advantage was taken of the polymorphism of the BaTbF6 fluoroterbate to analyse, on the basis of topological parameters such as bond distances and angles, the magnetic behaviour of its α and β forms. It was shown that superexchange interactions are present in β-BaTbF6, and that these interactions may also rule the magnetic behaviour of the other MTbF6 (M=Ca, Sr, Cd) tetravalent terbium fluorides.
dc.language.isoen
dc.publisherElsevier
dc.subjectTetravalent terbium
dc.subjectFluorides
dc.subjectNeutron diffraction
dc.subjectMagnetic structure
dc.subjectMetamagnetism
dc.subjectSuperexchange
dc.title.enMagnetic behaviour of the MTbF6 fluoroterbates (M=Cd, Ca, Sr, (α/β)-Ba)
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jssc.2011.10.030
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Solid State Chemistry
bordeaux.page229-237
bordeaux.volume185
bordeaux.peerReviewedoui
hal.identifierhal-00658556
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00658556v1
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