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Previous issue date: 2017-04-10 / The main objective of this thesis is to investigate the competing ordered
phases in the metallic heavy fermion compound URu2Si2, which displays a bodycentered
tetragonal lattice. We first provide a study case of the competition between
antiferromagnetic (AF) and spin liquid phases. The antiferromagnetic state is study
with spin-wave theory. Whereas the spin liquid analysis has been carried out in an
algebraic spin liquid representation. In the second part, we describe an effective theory
for Raman scattering experiments at these particular phases. We provide insight
about the hidden order phase displayed by the heavy fermion compound URu2Si2. / L?objectif central de cette th?se est d??tudier des phases ordonn?es en comp?tition
dans des mat?riaux magn?tiques pr?sentant une structure cristalline t?tragonale
centr?e. Ce travail est divis? en deux parties principales. Dans la premi?re,
nous pr?sentons les r?sultats de notre ?tude de la comp?tition entre des ?tats ordonn?s
antiferromagn?tiques et des phases liquides de spin. Nous montrons comment ces
derni?res peuvent ?tre stabilis?es par la frustration g?om?trique et par une g?n?ralisation
de la sym?trie de spin au groupe SU(n). Les ?tats antiferromagn?tiques sont
d?crits par une th?orie d?onde de spin et l?analyse de liquide de spin est effectu?e par
une repr?sentation fermionique des op?rateurs de spin. Dans la deuxi?me partie, nous
d?crivons une th?orie effective pour d?rcrire des exp?riences de diffusion Raman. Nous
fournissons un aper?u de la phase d?ordre cach? affich?e par le compos? de fermions
lourds URu2Si2.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/23653 |
| Date | 10 April 2017 |
| Creators | Farias, Carlene Paula Silva de |
| Contributors | 08158428487, http://lattes.cnpq.br/1699997982151255, Pereira, Rodrigo Gon?alves, 01324066679, http://lattes.cnpq.br/9293110312400359, Macri, Tommaso, 70940748401, http://lattes.cnpq.br/4580166672949340, Pagliuso, Pascoal, 15083453843, http://lattes.cnpq.br/0237905234427383, Magalh?es, S?rgio Garcia, 36096938000, http://lattes.cnpq.br/8564675492283232, Ferraz Filho, ?lvaro |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM F?SICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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