Experimentos de RPE em diferentes concentrações de oxigênio do supercondutor y Ba2 Cu3 07-X e dos compostos Ba Cu 02+X e Y2 Ba Cu 05

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Orientador: Gaston Eduardo Barberis / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin / Made available in DSpace on 2018-07-14T01:16:39Z (GMT). No. of bitstreams: 1
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Previous issue date: 1991 / Resumo: Não informado / Abstract: Room-temperature X- and Q- band ESR spectra of the high-Tc superconductor Yba2Cu3O7-x and the semiconductors Y2baCuO5 and BaCuO2+x are studied experimentally and theoretically by measuring, calculating, and fitting the powder spectra corresponding to an anisotropic Zeeman Hamiltonian for CU2+ in orthorhombic and tetragonal local symmetries ESR and x-ray studies in their corresponding oxygen-deficient stoichiometries, obtained by heat treatment under vacuum, were also done. Our results support those of Bowdeen et al. and Vier et al. in Rba2Cu3O7-x (R = Y, Eu), indicating that the Cu(1) and Cu(2) atoms in the pure Yba2Cu3O7-x phase are not ESR active and the small resonance observed in these compounds comes from other residual phases. The purest Yba2Cu3O7-x samples that we were able to prepare still have 0.1-0.5% mass fraction of other residual copper compounds which are responsible for the observed resonance / Mestrado / Física / Mestre em Física

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1. MESQUITA, Roberto Navarro de. Experimentos de RPE em diferentes concentrações de oxigênio do supercondutor y Ba2 Cu3 07-X e dos compostos Ba Cu 02+X e Y2 Ba Cu 05. 1991. [125]f. Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin, Campinas, SP. Disponível em: <http://www.repositorio.unicamp.br/handle/REPOSIP/277804>. Acesso em: 13 jul. 2018.
2. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277804

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Supercondutividade

Additional Fields

Identifer	oai:union.ndltd.org:IBICT/oai:repositorio.unicamp.br:REPOSIP/277804
Date	14 November 1991
Creators	Mesquita, Roberto Navarro de
Contributors	UNIVERSIDADE ESTADUAL DE CAMPINAS, Barberis, Gaston Eduardo, 1941-
Publisher	[s.n.], Universidade Estadual de Campinas. Instituto de Física Gleb Wataghin, Programa de Pós-Graduação em Física
Source Sets	IBICT Brazilian ETDs
Language	Portuguese
Detected Language	English
Type	info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis
Format	[125]f. : il., application/pdf
Source	reponame:Repositório Institucional da Unicamp, instname:Universidade Estadual de Campinas, instacron:UNICAMP
Rights	info:eu-repo/semantics/openAccess