Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1103/PhysRevB.102.024436 http://hdl.handle.net/11449/197098 |
Resumo: | The 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. |
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Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6The 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.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)Fundacao de Amparo a Pesquisa do Estado de Goias (FAPEG)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go, BrazilTech Univ Carolo Wilhelmina Braunschweig, Inst Phys Kondensierten Materie, D-38106 Braunschweig, GermanyTech Univ Dresden, Inst Festkorper & Mat Phys, D-01069 Dresden, GermanyCtr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, RJ, BrazilUniv Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, BrazilCtr Nacl Pesquisa Energia & Mat, Lab Nacl Luz Sincrotron, BR-13083970 Campinas, SP, BrazilSao Paulo State Univ, Dept Phys & Chem, BR-15385000 Ilha Solteira, SP, BrazilSao Paulo State Univ, Dept Phys & Chem, BR-15385000 Ilha Solteira, SP, BrazilCNPq: 400134/2016-0FAPERJ: Li 244/12Amer Physical SocUniversidade Federal de Goiás (UFG)Tech Univ Carolo Wilhelmina BraunschweigTech Univ DresdenCtr Brasileiro Pesquisas FisUniversidade Estadual de Campinas (UNICAMP)Ctr Nacl Pesquisa Energia & MatUniversidade Estadual Paulista (Unesp)Bufaical, L.Sadrollahi, E.Litterst, F. J.Rigitano, D.Granado, E.Coutrim, L. T.Araujo, E. B. [UNESP]Fontes, M. B.Baggio-Saitovitch, E.Bittar, E. M.2020-12-10T20:06:06Z2020-12-10T20:06:06Z2020-07-22info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article13http://dx.doi.org/10.1103/PhysRevB.102.024436Physical Review B. College Pk: Amer Physical Soc, v. 102, n. 2, 13 p., 2020.2469-9950http://hdl.handle.net/11449/19709810.1103/PhysRevB.102.024436WOS:000550992600002Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review Binfo:eu-repo/semantics/openAccess2021-10-23T11:27:26Zoai:repositorio.unesp.br:11449/197098Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T11:27:26Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6 |
title |
Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6 |
spellingShingle |
Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6 Bufaical, L. |
title_short |
Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6 |
title_full |
Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6 |
title_fullStr |
Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6 |
title_full_unstemmed |
Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6 |
title_sort |
Effect of structural and magnetic disorder on the 3d-5d exchange interactions in La2-xCaxCoIrO6 |
author |
Bufaical, L. |
author_facet |
Bufaical, L. Sadrollahi, E. Litterst, F. J. Rigitano, D. Granado, E. Coutrim, L. T. Araujo, E. B. [UNESP] Fontes, M. B. Baggio-Saitovitch, E. Bittar, E. M. |
author_role |
author |
author2 |
Sadrollahi, E. Litterst, F. J. Rigitano, D. Granado, E. Coutrim, L. T. Araujo, E. B. [UNESP] Fontes, M. B. Baggio-Saitovitch, E. Bittar, E. M. |
author2_role |
author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de Goiás (UFG) Tech Univ Carolo Wilhelmina Braunschweig Tech Univ Dresden Ctr Brasileiro Pesquisas Fis Universidade Estadual de Campinas (UNICAMP) Ctr Nacl Pesquisa Energia & Mat Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Bufaical, L. Sadrollahi, E. Litterst, F. J. Rigitano, D. Granado, E. Coutrim, L. T. Araujo, E. B. [UNESP] Fontes, M. B. Baggio-Saitovitch, E. Bittar, E. M. |
description |
The 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. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-10T20:06:06Z 2020-12-10T20:06:06Z 2020-07-22 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1103/PhysRevB.102.024436 Physical Review B. College Pk: Amer Physical Soc, v. 102, n. 2, 13 p., 2020. 2469-9950 http://hdl.handle.net/11449/197098 10.1103/PhysRevB.102.024436 WOS:000550992600002 |
url |
http://dx.doi.org/10.1103/PhysRevB.102.024436 http://hdl.handle.net/11449/197098 |
identifier_str_mv |
Physical Review B. College Pk: Amer Physical Soc, v. 102, n. 2, 13 p., 2020. 2469-9950 10.1103/PhysRevB.102.024436 WOS:000550992600002 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physical Review B |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
13 |
dc.publisher.none.fl_str_mv |
Amer Physical Soc |
publisher.none.fl_str_mv |
Amer Physical Soc |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
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Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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