Use este identificador para citar ou linkar para este item: https://repositorio.ufms.br/handle/123456789/14378
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Campo DCValorIdioma
dc.creatorFernandes, Victor Fidelis-
dc.date.accessioned2026-05-13T14:55:38Z-
dc.date.available2026-05-13T14:55:38Z-
dc.date.issued2026-02-26-
dc.identifier.urihttps://repositorio.ufms.br/handle/123456789/14378-
dc.description.abstractThe magnetic and electronic properties of materials are governed by the complex interplay between localized exchange interactions and coupling with itinerant electrons. This work investigates the competition between magnetic frustration and the Kondo effect in a J1 − J2 square lattice. Magnetic frustration is introduced through competing nearest-neighbor (J1) and next-nearest-neighbor (J2) interactions. The Kondo effect, governed by the coupling JK, introduces a nonmagnetic screening mechanism via the formation of Kondo inglets. To solve the resulting Hamiltonian, we employ a rigorous Cluster Mean-Field (CMF) approximation coupled with exact diagonalization on a 4-site cluster. The methodology is validated by reproducing the known J1 − J2 phase diagram, which shows the suppression of the N´eel temperature (TN ) at the point of maximum frustration (J2/J1 ≈ 0.5). The results demonstrate that the introduction of JK further suppresses long-range magnetic order, promoting the formation of a Kondo singlet state, particularly in the highly frustrated regime. These findings characterize the quantum boundaries between magnetic and non-magnetic phases and provide a crucial foundation for mapping the full phase diagram across varying coupling strengths and electron densities.pt_BR
dc.description.sponsorshipFUNDECTpt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Mato Grosso do Sulpt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectSingleto Kondopt_BR
dc.subjectKondo Singletpt_BR
dc.subjectFrustracao Magneticapt_BR
dc.subjectMagnetic Frustrationpt_BR
dc.subjectModelo J1 − J2pt_BR
dc.subjectJ1 − J2 Modelpt_BR
dc.subjectTeoria de Campo Médio de Clusterpt_BR
dc.subjectCluster Mean-Field Theorypt_BR
dc.titleMagnetic Properties of the frustrated J1-J2 square lattice with Kondo interactionspt_BR
dc.typeDissertaçãopt_BR
dc.contributor.advisor1Zimmer, Fabio Mallmann-
dc.contributor.advisor1IDhttps://orcid.org/0000-0002-3822-8188pt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/6328420212181284pt_BR
dc.contributor.referee1Morais Jr, Carlos Alberto Vaz de-
dc.contributor.referee2Silva, Willian Carvalho da-
dc.creator.IDhttps://orcid.org/0000-0002-0452-6080pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/5314512781364370pt_BR
dc.description.resumoAs propriedades magnéticas e eletrônicas dos materiais são regidas pela complexa interconexão entre interações de troca localizadas e o acoplamento com elétrons itinerantes. Este trabalho investiga a competição entre a frustração magnética e o efeito Kondo em uma rede quadrada J1 − J2. A frustração magnética é introduzida por interações competitivas entre vizinhos mais proximos (J1) e segundos vizinhos (J2). O efeito Kondo, governado pelo acoplamento JK, introduz um mecanismo de blindagem não magnética através da formaçao de singletos de Kondo. Para resolver o Hamiltoniano resultante, empregou-se uma aproximaçao de Campo Médio de Cluster (CMF) acoplada à diagonalização exata em um cluster de 4 sítios. A metodologia é validada pela reprodução do diagrama de fases conhecido do modelo J1 − J2, demonstrando a supressão da temperatura de Néel (TN) no ponto de máxima frustração (J2/J1 ≈ 0.5). Os resultados demonstram que a introdução de JK suprime a ordem magnética de longo alcance, podendo promover a formação de um estado de singleto de Kondo, especialmente no regime de alta frustração. Estes achados caracterizam as fronteiras quânticas entre fases magnéticas e não magnéticas, estabelecendo uma base crucial para o mapeamento do diagrama de fases completo sob diferentes intensidades de acoplamento e densidades eletrônicas.pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentINFIpt_BR
dc.publisher.programPrograma de Pós Graduação em Ciência dos Materiaispt_BR
dc.publisher.initialsUFMSpt_BR
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dc.subject.cnpqCiência dos Materiaispt_BR
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