Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe)
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFS |
Texto Completo: | https://ri.ufs.br/jspui/handle/riufs/18247 |
Resumo: | In this work, the effects of the crystalline electric field on the isostructural compounds of ErM4Al8 (M = Cu and Fe) were investigated. The samples were produced by arc furnace melting. X-ray diffraction measurements (XRD) confirmed the presence of a single phase with a tetragonal structure of type ThMn12 and space group I4/mmm. A spin model based on the solution of the crystalline electric field Hamiltonian was used to extract the crystalline field parameters, the wave functions and build a level scheme, from magnetization measurements as a function of the magnetic field and temperature. The X-ray diffraction analyzes show that the global and local symmetry do not change for the samples grown with copper and iron and, in addition, the average distances between the ions remain the same. On the other hand, crystal field parameters vary appreciably from one sample to the next. This fact was related to the change in the electronic structure of the transition metal ions. Calculations based on first principles show that the d-electrons from the iron go to the Fermi surface and thus must contribute an electrostatic shielding effect to the crystalline electric field when compared to the sample grown with copper. |
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Santos, Barbeny de JesusDuque, José Gerivaldo dos Santos2023-09-04T15:26:34Z2023-09-04T15:26:34Z2023-02-15SANTOS, Barbeny de Jesus. Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe). 2023. 77 f. Dissertação (Mestrado em Física) – Universidade Federal de Sergipe, São Cristóvão, 2023.https://ri.ufs.br/jspui/handle/riufs/18247In this work, the effects of the crystalline electric field on the isostructural compounds of ErM4Al8 (M = Cu and Fe) were investigated. The samples were produced by arc furnace melting. X-ray diffraction measurements (XRD) confirmed the presence of a single phase with a tetragonal structure of type ThMn12 and space group I4/mmm. A spin model based on the solution of the crystalline electric field Hamiltonian was used to extract the crystalline field parameters, the wave functions and build a level scheme, from magnetization measurements as a function of the magnetic field and temperature. The X-ray diffraction analyzes show that the global and local symmetry do not change for the samples grown with copper and iron and, in addition, the average distances between the ions remain the same. On the other hand, crystal field parameters vary appreciably from one sample to the next. This fact was related to the change in the electronic structure of the transition metal ions. Calculations based on first principles show that the d-electrons from the iron go to the Fermi surface and thus must contribute an electrostatic shielding effect to the crystalline electric field when compared to the sample grown with copper.Neste trabalho, investigou-se os efeitos do campo elétrico cristalino nos compostos isoestruturais de ErM4Al8 (M = Cu e Fe). As amostras foram produzidas por fusão forno à arco. Medidas de difração de raios X (DRX) confirmaram a presença de fase única com estrutura tetragonal do tipo ThMn12 e grupo espacial I4/mmm. Um modelo de spin baseado na solução da Hamiltoniana de campo elétrico cristalino foi usado para extrair os parâmetros de campo cristalino, as funções de onda e construir um esquema de níveis, a partir de medidas de magnetização em função do campo magnético e da temperatura. As análises de difração de raios X mostram que a simetria global e local não mudam para as amostras crescidas com cobre e ferro e, além disso, as distâncias médias entre os íons permanecem iguais. Por outro lado, os parâmetros de campo cristalino variam apreciavelmente de uma amostra para a outra. Relacionou-se esse fato com a mudança na estrutura eletrônica dos íons de metal de transição. Cálculos baseados em primeiros princípios mostram que os elétrons d do ferro vão para a superfície de Fermi e, assim, devem contribuir com um efeito de blindagem eletrostática do campo elétrico cristalino quando comparado com a amostra crescida com cobre.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESSão CristóvãoporDifração de raios XCampos magnéticosCampos elétricosTransição de faseMagnetizaçãoInteração RKKYCampo elétrico cristalinoX-ray diffractionPhase transitionMagnetizationInteraction RKKYCrystalline electric fieldCIENCIAS EXATAS E DA TERRA::FISICAEfeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe)info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisPós-Graduação em FísicaUniversidade Federal de Sergipe (UFS)reponame:Repositório Institucional da UFSinstname:Universidade Federal de Sergipe (UFS)instacron:UFSinfo:eu-repo/semantics/openAccessLICENSElicense.txtlicense.txttext/plain; charset=utf-81475https://ri.ufs.br/jspui/bitstream/riufs/18247/1/license.txt098cbbf65c2c15e1fb2e49c5d306a44cMD51ORIGINALBARBENY_JESUS_SANTOS.pdfBARBENY_JESUS_SANTOS.pdfapplication/pdf7960622https://ri.ufs.br/jspui/bitstream/riufs/18247/2/BARBENY_JESUS_SANTOS.pdf397df9d409989e3554b1882c1f18218eMD52TEXTBARBENY_JESUS_SANTOS.pdf.txtBARBENY_JESUS_SANTOS.pdf.txtExtracted texttext/plain106786https://ri.ufs.br/jspui/bitstream/riufs/18247/3/BARBENY_JESUS_SANTOS.pdf.txt5cf90c5331ea5bfa3e715b465ee8a0afMD53THUMBNAILBARBENY_JESUS_SANTOS.pdf.jpgBARBENY_JESUS_SANTOS.pdf.jpgGenerated Thumbnailimage/jpeg1450https://ri.ufs.br/jspui/bitstream/riufs/18247/4/BARBENY_JESUS_SANTOS.pdf.jpgc93341f48bae345f462419e07cd56496MD54riufs/182472023-09-04 12:26:39.245oai:ufs.br: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Repositório InstitucionalPUBhttps://ri.ufs.br/oai/requestrepositorio@academico.ufs.bropendoar:2023-09-04T15:26:39Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS)false |
dc.title.pt_BR.fl_str_mv |
Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe) |
title |
Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe) |
spellingShingle |
Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe) Santos, Barbeny de Jesus Difração de raios X Campos magnéticos Campos elétricos Transição de fase Magnetização Interação RKKY Campo elétrico cristalino X-ray diffraction Phase transition Magnetization Interaction RKKY Crystalline electric field CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe) |
title_full |
Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe) |
title_fullStr |
Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe) |
title_full_unstemmed |
Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe) |
title_sort |
Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe) |
author |
Santos, Barbeny de Jesus |
author_facet |
Santos, Barbeny de Jesus |
author_role |
author |
dc.contributor.author.fl_str_mv |
Santos, Barbeny de Jesus |
dc.contributor.advisor1.fl_str_mv |
Duque, José Gerivaldo dos Santos |
contributor_str_mv |
Duque, José Gerivaldo dos Santos |
dc.subject.por.fl_str_mv |
Difração de raios X Campos magnéticos Campos elétricos Transição de fase Magnetização Interação RKKY Campo elétrico cristalino |
topic |
Difração de raios X Campos magnéticos Campos elétricos Transição de fase Magnetização Interação RKKY Campo elétrico cristalino X-ray diffraction Phase transition Magnetization Interaction RKKY Crystalline electric field CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
X-ray diffraction Phase transition Magnetization Interaction RKKY Crystalline electric field |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::FISICA |
description |
In this work, the effects of the crystalline electric field on the isostructural compounds of ErM4Al8 (M = Cu and Fe) were investigated. The samples were produced by arc furnace melting. X-ray diffraction measurements (XRD) confirmed the presence of a single phase with a tetragonal structure of type ThMn12 and space group I4/mmm. A spin model based on the solution of the crystalline electric field Hamiltonian was used to extract the crystalline field parameters, the wave functions and build a level scheme, from magnetization measurements as a function of the magnetic field and temperature. The X-ray diffraction analyzes show that the global and local symmetry do not change for the samples grown with copper and iron and, in addition, the average distances between the ions remain the same. On the other hand, crystal field parameters vary appreciably from one sample to the next. This fact was related to the change in the electronic structure of the transition metal ions. Calculations based on first principles show that the d-electrons from the iron go to the Fermi surface and thus must contribute an electrostatic shielding effect to the crystalline electric field when compared to the sample grown with copper. |
publishDate |
2023 |
dc.date.accessioned.fl_str_mv |
2023-09-04T15:26:34Z |
dc.date.available.fl_str_mv |
2023-09-04T15:26:34Z |
dc.date.issued.fl_str_mv |
2023-02-15 |
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 |
SANTOS, Barbeny de Jesus. Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe). 2023. 77 f. Dissertação (Mestrado em Física) – Universidade Federal de Sergipe, São Cristóvão, 2023. |
dc.identifier.uri.fl_str_mv |
https://ri.ufs.br/jspui/handle/riufs/18247 |
identifier_str_mv |
SANTOS, Barbeny de Jesus. Efeitos do campo elétrico cristalino nos compostos isoestruturais ErM4Al8 (M = Cu, Fe). 2023. 77 f. Dissertação (Mestrado em Física) – Universidade Federal de Sergipe, São Cristóvão, 2023. |
url |
https://ri.ufs.br/jspui/handle/riufs/18247 |
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por |
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por |
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openAccess |
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Pós-Graduação em Física |
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Universidade Federal de Sergipe (UFS) |
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Universidade Federal de Sergipe (UFS) |
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UFS |
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UFS |
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