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Phase transitions and magnetic structures in MnW1-xMoxO4 compounds (x 0.2)

hal.structure.identifierLaboratoire de cristallographie et sciences des matériaux [CRISMAT]
dc.contributor.authorHARDY, Vincent
hal.structure.identifierInstitut des Matériaux Jean Rouxel [IMN]
dc.contributor.authorPAYEN, Christophe
hal.structure.identifierLaboratoire Léon Brillouin [LLB - UMR 12]
dc.contributor.authorDAMAY, Françoise
hal.structure.identifierInstitut des Matériaux Jean Rouxel [IMN]
dc.contributor.authorMEDDAR, Lynda
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorJOSSE, Michaël
hal.structure.identifierInstitut méditerranéen de biodiversité et d'écologie marine et continentale [IMBE]
dc.contributor.authorANDRÉ, Gilles
dc.date.issued2016-08-24
dc.identifier.issn0953-8984
dc.description.abstractEnTemperature-dependent specific heat, magnetization and neutron diffraction data have been collected in zero magnetic field for polycrystalline samples of MnW1−x Mo x O4 (x  ≤  0.2) solid solution whose end-member MnWO4 exhibits a magnetoelectric multiferroic phase (AF2 phase) between T 1  ≈  8 K and T 2  =  12.5 K. In MnW1−x Mo x O4, diamagnetic W6+ are replaced with diamagnetic Mo6+ cations and magnetic couplings among Mn2+ (3d 5, S  =  5/2) ions are modified due the doping-induced tuning of the orbital hybridization between Mn 3d and O 2p states. It was observed that magnetic phase transition temperatures which are associated with the second-order AF3-to-paramagnetic (T N) and AF2-to-AF3 (T 2) transitions in pure MnWO4 slightly increase with the Mo content x. Magnetic specific heat data also indicate that the first-order AF1-to-AF2 phase transition at T 1 survives a weak doping x  ≤  0.05. This latter phase transition becomes invisible above the base temperature 2 K for higher level of doping x  ≥  0.10. Neutron powder diffraction datasets collected above 1.5 K for a sample of MnW0.8Mo0.2O4 were analyzed using the Rietveld method. The magnetic structure below  ≈  14 K is a helical incommensurate spin order with a temperature-independent propagation vector k  =  (−0.217(6), 0.5, 0.466(4)). This cycloidal magnetic structure is similar to the polar AF2 structure observed in MnWO4. The AF1 up-up-down-down collinear spin arrangement observed in MnWO4 is absent in our MnW0.8Mo0.2O4 sample.
dc.language.isoen
dc.publisherIOP Publishing
dc.title.enPhase transitions and magnetic structures in MnW1-xMoxO4 compounds (x 0.2)
dc.typeArticle de revue
dc.identifier.doi10.1088/0953-8984/28/33/336003
dc.subject.halPhysique [physics]
bordeaux.journalJournal of Physics: Condensed Matter
bordeaux.page336003 (11 p.)
bordeaux.volume28
bordeaux.issue33
bordeaux.peerReviewedoui
hal.identifierhal-02161194
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02161194v1
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