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Determinação dos parâmetros de acoplamento órbita rede em ligas de terras raras e metais nobres atraves de ressonância paramagnética eletrônica

Orientador: Carlos Rettori / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin / Made available in DSpace on 2018-07-17T22:38:48Z (GMT). No. of bitstreams: 1
Pela_CarlosAlberto_D.pdf: 3166888 bytes, checksum: 1c4732744726cb88091afc04781b3ba9 (MD5)
Previous issue date: 1979 / Resumo: Não informado / a Abstract: ESR experiments on diluted Er in Au and Ag and Dy in Ag thin films ( 300 Å - 5000 Å ) evaporated on NaCl and quartz substrates, were carried out at liquid helium temperatures. The anisotropy observed on the g - value, linewidth and lineshape were interpreted in terms of stress-induced admixtures of excited crystalline field levels with the G7 ground state, due to the difference in the thermal expansion coefficients between substrate and film. The data allows the estimation of lower limits for the tetragonal and trigonal second order spin-lattice coupling parameters. In Au their magnitude and sign agrees with that predicted by the point charge model, while in Ag the trigonal parameter does not. From the anisotropy of the g - value, linewidth and lineshape we were able to get some idea about the strain distribution across the film / Doutorado / Física / Doutor em Ciências

Identiferoai:union.ndltd.org:IBICT/oai:repositorio.unicamp.br:REPOSIP/277535
Date22 July 1979
CreatorsPela, Carlos Alberto
ContributorsUNIVERSIDADE ESTADUAL DE CAMPINAS, Rettori, Carlos, 1941-
Publisher[s.n.], Universidade Estadual de Campinas. Instituto de Física Gleb Wataghin, Programa de Pós-Graduação em Física
Source SetsIBICT Brazilian ETDs
LanguagePortuguese
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis
Format138 f. : il., application/pdf
Sourcereponame:Repositório Institucional da Unicamp, instname:Universidade Estadual de Campinas, instacron:UNICAMP
Rightsinfo:eu-repo/semantics/openAccess

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