Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6

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Autor(es): dc.contributorUniversidade Federal de Goiás (UFG)-
Autor(es): dc.contributorTech Univ Carolo Wilhelmina Braunschweig-
Autor(es): dc.contributorTech Univ Dresden-
Autor(es): dc.contributorCtr Brasileiro Pesquisas Fis-
Autor(es): dc.contributorUniversidade Estadual de Campinas (UNICAMP)-
Autor(es): dc.contributorCtr Nacl Pesquisa Energia & Mat-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.creatorBufaical, L.-
Autor(es): dc.creatorSadrollahi, E.-
Autor(es): dc.creatorLitterst, F. J.-
Autor(es): dc.creatorRigitano, D.-
Autor(es): dc.creatorGranado, E.-
Autor(es): dc.creatorCoutrim, L. T.-
Autor(es): dc.creatorAraujo, E. B. [UNESP]-
Autor(es): dc.creatorFontes, M. B.-
Autor(es): dc.creatorBaggio-Saitovitch, E.-
Autor(es): dc.creatorBittar, E. M.-
Data de aceite: dc.date.accessioned2022-02-22T00:11:16Z-
Data de disponibilização: dc.date.available2022-02-22T00:11:16Z-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2020-07-22-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1103/PhysRevB.102.024436-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/197098-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/197098-
Descrição: dc.descriptionThe delicate balance between spin-orbit coupling, Coulomb repulsion, and crystalline electric field interactions observed in Ir-based oxides is usually manifested as exotic magnetic behavior. Here we investigate the evolution of the exchange coupling between Co and Ir for partial La substitution by Ca in La2CoIrO6. A great advantage of the use of Ca2+ as a replacement for La3+ is the similarity of their ionic radii. Thus, the observed magnetic changes can more easily be associated with electronic variations. A thorough investigation of the structural, electronic, and magnetic properties of the La2-xCaxCoIrO6 system was carried out by means of synchrotron x-ray powder diffraction, muon spin rotation and relaxation (mu SR), AC and DC magnetization, x-ray absorption spectroscopy (XAS), x-ray magnetic circular dichroism, Raman spectroscopy, electrical resistivity, and dielectric permittivity. Our XAS results show that up to 25% Ca substitution at the La site results in the emergence of Co3+, possibly in a high-spin state, while the introduction of a larger amount of Ca leads to an increase in the Ir valence. The competing magnetic interactions resulting from the mixed valences lead to the coexistence of a magnetically ordered and an emerging spin-glass (SG) state for the doped samples. Our mu SR results indicate that for La2CoIrO6 a nearly constant fraction of a paramagnetic (PM) phase persists down to low temperatures, possibly related to the presence of a small amount of Ir3+ and to the antisite disorder at Co/Ir sites. For doped compounds the PM phase freezes below 30 K, but there is still some dynamics associated with the SG. The dielectric data obtained for the parent compound and the one with 25% Ca doping indicate a possible magnetodielectric effect, which is discussed in terms of the electron hopping between the transition-metal ions, the antisite disorder at Co/Ir sites, and the distorted crystalline structure.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)-
Descrição: dc.descriptionFundacao de Amparo a Pesquisa do Estado de Goias (FAPEG)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionUniv Fed Goias, Inst Fis, BR-74001970 Goiania, Go, Brazil-
Descrição: dc.descriptionTech Univ Carolo Wilhelmina Braunschweig, Inst Phys Kondensierten Materie, D-38106 Braunschweig, Germany-
Descrição: dc.descriptionTech Univ Dresden, Inst Festkorper & Mat Phys, D-01069 Dresden, Germany-
Descrição: dc.descriptionCtr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, RJ, Brazil-
Descrição: dc.descriptionUniv Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazil-
Descrição: dc.descriptionCtr Nacl Pesquisa Energia & Mat, Lab Nacl Luz Sincrotron, BR-13083970 Campinas, SP, Brazil-
Descrição: dc.descriptionSao Paulo State Univ, Dept Phys & Chem, BR-15385000 Ilha Solteira, SP, Brazil-
Descrição: dc.descriptionSao Paulo State Univ, Dept Phys & Chem, BR-15385000 Ilha Solteira, SP, Brazil-
Descrição: dc.descriptionCNPq: 400134/2016-0-
Descrição: dc.descriptionFAPERJ: Li 244/12-
Formato: dc.format13-
Idioma: dc.languageen-
Publicador: dc.publisherAmer Physical Soc-
Relação: dc.relationPhysical Review B-
???dc.source???: dc.sourceWeb of Science-
Título: dc.titleEffect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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