Role of oxygen vacancies in the magnetic and dielectric properties of the high-dielectric-constant system CaCu3 Ti4 O12: An electron-spin resonance study

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Autor(es): dc.contributorUniversidade Estadual de Campinas (UNICAMP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversity of Miami-
Autor(es): dc.contributorSan Diego State University-
Autor(es): dc.contributorUniversidade Federal de Gois-
Autor(es): dc.creatorPires, M. A.-
Autor(es): dc.creatorIsrael, C.-
Autor(es): dc.creatorIwamoto, W.-
Autor(es): dc.creatorUrbano, R. R.-
Autor(es): dc.creatorAgüero, O.-
Autor(es): dc.creatorTorriani, I.-
Autor(es): dc.creatorRettori, C.-
Autor(es): dc.creatorPagliuso, P. G.-
Autor(es): dc.creatorWalmsley, L.-
Autor(es): dc.creatorLe, Z.-
Autor(es): dc.creatorCohn, J. L.-
Autor(es): dc.creatorOseroff, S. B.-
Data de aceite: dc.date.accessioned2025-08-21T18:16:05Z-
Data de disponibilização: dc.date.available2025-08-21T18:16:05Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2006-06-08-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1103/PhysRevB.73.224404-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/224761-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/224761-
Descrição: dc.descriptionWe report experiments of electron spin resonance (ESR) of Cu2+ in polycrystalline samples of CaCu3 Ti4 O12 post-annealed in different atmospheres. After being synthesized by solid state reaction, pellets of CaCu3 Ti4 O12 were annealed for 24 h at 1000°C under air, Ar or O2. Our temperature dependent ESR data revealed for all samples nearly temperature independent g value (2.15(1)) and linewidth for T TN ≈25 K. However, the values of ESR linewidth are strongly affected by the oxygen content in the sample. For instance, argon post-annealed samples show a much larger linewidth than the O2 or air post-annealed samples. We attribute this broadening to an increase of the dipolar homogeneous broadening of the Cu2+ ESR lines due to the presence of oxygen vacancies which induce an S=1 2 spin inside the TiO6 octahedra. Correlation between a systematic dependence of the ESR linewidth on the oxygen content and the high dielectric constant of these materials is addressed. Also, ESR, magnetic susceptibility, and specific heat data for a single crystal of CaCu3 Ti4 O12 and for polycrystals of CdCu3 Ti4 O12 are reported. © 2006 The American Physical Society.-
Descrição: dc.descriptionInstituto de Física Gleb Wataghin UNICAMP, 13083-970, Campinas-SP-
Descrição: dc.descriptionDepartamento de Física Instituto de Geocincias e C. Exatas Universidade Estadual Paulista, C.P. 178, Rio Claro-SP, CEP 13500-970, S.P.-
Descrição: dc.descriptionPhysics Department University of Miami, Coral Gables, FL 33124-
Descrição: dc.descriptionSan Diego State University, San Diego, CA 92182-
Descrição: dc.descriptionUniversidade Federal de Gois, 74001-970 Goinia-Go-
Descrição: dc.descriptionDepartamento de Física Instituto de Geocincias e C. Exatas Universidade Estadual Paulista, C.P. 178, Rio Claro-SP, CEP 13500-970, S.P.-
Idioma: dc.languageen-
Relação: dc.relationPhysical Review B - Condensed Matter and Materials Physics-
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Título: dc.titleRole of oxygen vacancies in the magnetic and dielectric properties of the high-dielectric-constant system CaCu3 Ti4 O12: An electron-spin resonance study-
Tipo de arquivo: dc.typelivro digital-
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