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Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl)

Detalhes bibliográficos
Ano de defesa: 2019
Autor(a) principal: Medeiros, Fabio Eduardo de Oliveira
Orientador(a): Ayala, Alejandro Pedro
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Materiais Multiferroicos
Espectroscopia Raman
Acoplamento spin-fônon
Brometo de cobre
Cloreto de cobre
Link de acesso: http://www.repositorio.ufc.br/handle/riufc/40298
Resumo: With the growth of interest in muitrferroic materials in the last years, many techniques have been used in their base study in order to provide more knowledge about the operation of their ferrous characteristics, being them ferroelectricity, ferro/antiferromagnetism and ferroelasticity. In the present work the Raman scattering spectroscopy technique was applied in order to observe the behavior of the active Raman vibrational modes of the multiferroic copper chloride (CuCl2) and copper bromide (CuBr2) subjected to low temperatures and the possible existence of the spin-phonon coupling present in them. On the other hand, a study using Ramam spectroscopy and simultaneous thermal analysis of thermogravimetry (TG) and differential scanning calorimetry (DCS) was carried out by monitoring the transition of copper chloride from its dihydrated and orthorhombic phase (CuCl2⋅2H2O) for its anhydrous and monoclinic phase (CuCl2) when subjected to heating dehydration.
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spelling Medeiros, Fabio Eduardo de OliveiraAyala, Alejandro Pedro2019-03-15T11:33:25Z2019-03-15T11:33:25Z2019Medeiros, F. E. O. Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl). 2019. 47 f. Dissertação (Mestrado em Física) - Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2019.http://www.repositorio.ufc.br/handle/riufc/40298With the growth of interest in muitrferroic materials in the last years, many techniques have been used in their base study in order to provide more knowledge about the operation of their ferrous characteristics, being them ferroelectricity, ferro/antiferromagnetism and ferroelasticity. In the present work the Raman scattering spectroscopy technique was applied in order to observe the behavior of the active Raman vibrational modes of the multiferroic copper chloride (CuCl2) and copper bromide (CuBr2) subjected to low temperatures and the possible existence of the spin-phonon coupling present in them. On the other hand, a study using Ramam spectroscopy and simultaneous thermal analysis of thermogravimetry (TG) and differential scanning calorimetry (DCS) was carried out by monitoring the transition of copper chloride from its dihydrated and orthorhombic phase (CuCl2⋅2H2O) for its anhydrous and monoclinic phase (CuCl2) when subjected to heating dehydration.Com o crescimento do interesse em materiais muitlferróicos nos últimos anos, muitas técnicas vem sendo empregadas em seu estudo de base com a finalidade de proporcionar mais conhecimento sobre o funcionamento de suas características ferróicas, sendo elas a ferroeletricidade, ferro/antiferromagnetismo e ferroelasticidade. No presente trabalho foi aplicada a técnica de espectroscopia de espalhamento Raman, com o objetivo de observar o comportamento dos modos vibracionais Raman ativos dos multiferróicos cloreto de cobre (CuCl2) e brometo de cobre (CuBr2), submetidos a baixas temperaturas e a possível existência do acoplamento spin-fônon presente neles. Por outro lado, um estudo utilizando a espectroscopia Ramam e análise térmica simultânea de termogravimetria (TG) e calorimetria diferencial exploratória (DCS), foi realizado monitorando a transição do cloreto de cobre de sua fase dihidratada e ortorrômbica (CuCl2⋅2H2O) para sua fase anidra e monoclínica (CuCl2) quando submetido a desidratação por aquecimento.Materiais MultiferroicosEspectroscopia RamanAcoplamento spin-fônonBrometo de cobreCloreto de cobreAcoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl)info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisporreponame:Repositório Institucional da Universidade Federal do Ceará (UFC)instname:Universidade Federal do Ceará (UFC)instacron:UFCinfo:eu-repo/semantics/openAccessLICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://repositorio.ufc.br/bitstream/riufc/40298/4/license.txt8a4605be74aa9ea9d79846c1fba20a33MD54ORIGINAL2019_dis_feomedeiros.pdf2019_dis_feomedeiros.pdfapplication/pdf4178515http://repositorio.ufc.br/bitstream/riufc/40298/3/2019_dis_feomedeiros.pdfa40e689af0db2b25e64c50674a3631b0MD53riufc/402982019-03-15 08:33:25.099oai:repositorio.ufc.br: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Repositório InstitucionalPUBhttp://www.repositorio.ufc.br/ri-oai/requestbu@ufc.br || repositorio@ufc.bropendoar:2019-03-15T11:33:25Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)false
dc.title.pt_BR.fl_str_mv Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl)
title Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl)
spellingShingle Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl)
Medeiros, Fabio Eduardo de Oliveira
Materiais Multiferroicos
Espectroscopia Raman
Acoplamento spin-fônon
Brometo de cobre
Cloreto de cobre
title_short Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl)
title_full Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl)
title_fullStr Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl)
title_full_unstemmed Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl)
title_sort Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl)
author Medeiros, Fabio Eduardo de Oliveira
author_facet Medeiros, Fabio Eduardo de Oliveira
author_role author
dc.contributor.author.fl_str_mv Medeiros, Fabio Eduardo de Oliveira
dc.contributor.advisor1.fl_str_mv Ayala, Alejandro Pedro
contributor_str_mv Ayala, Alejandro Pedro
dc.subject.por.fl_str_mv Materiais Multiferroicos
Espectroscopia Raman
Acoplamento spin-fônon
Brometo de cobre
Cloreto de cobre
topic Materiais Multiferroicos
Espectroscopia Raman
Acoplamento spin-fônon
Brometo de cobre
Cloreto de cobre
description With the growth of interest in muitrferroic materials in the last years, many techniques have been used in their base study in order to provide more knowledge about the operation of their ferrous characteristics, being them ferroelectricity, ferro/antiferromagnetism and ferroelasticity. In the present work the Raman scattering spectroscopy technique was applied in order to observe the behavior of the active Raman vibrational modes of the multiferroic copper chloride (CuCl2) and copper bromide (CuBr2) subjected to low temperatures and the possible existence of the spin-phonon coupling present in them. On the other hand, a study using Ramam spectroscopy and simultaneous thermal analysis of thermogravimetry (TG) and differential scanning calorimetry (DCS) was carried out by monitoring the transition of copper chloride from its dihydrated and orthorhombic phase (CuCl2⋅2H2O) for its anhydrous and monoclinic phase (CuCl2) when subjected to heating dehydration.
publishDate 2019
dc.date.accessioned.fl_str_mv 2019-03-15T11:33:25Z
dc.date.available.fl_str_mv 2019-03-15T11:33:25Z
dc.date.issued.fl_str_mv 2019
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.citation.fl_str_mv Medeiros, F. E. O. Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl). 2019. 47 f. Dissertação (Mestrado em Física) - Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2019.
dc.identifier.uri.fl_str_mv http://www.repositorio.ufc.br/handle/riufc/40298
identifier_str_mv Medeiros, F. E. O. Acoplamento spin-fônon nos multiferróicos CuX2 (X = Br, Cl). 2019. 47 f. Dissertação (Mestrado em Física) - Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2019.
url http://www.repositorio.ufc.br/handle/riufc/40298
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dc.source.none.fl_str_mv reponame:Repositório Institucional da Universidade Federal do Ceará (UFC)
instname:Universidade Federal do Ceará (UFC)
instacron:UFC
instname_str Universidade Federal do Ceará (UFC)
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reponame_str Repositório Institucional da Universidade Federal do Ceará (UFC)
collection Repositório Institucional da Universidade Federal do Ceará (UFC)
bitstream.url.fl_str_mv http://repositorio.ufc.br/bitstream/riufc/40298/4/license.txt
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