Modelo de Hubbard na caracterização de fases magnéticas em cadeias poliméricas bipartidas generalizadas

• Autor(a) principal: Nascimento, Adler da Cruz
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFS
• Texto Completo: https://ri.ufs.br/handle/riufs/5383
• topic: Física; Modelo de Hubbard; Compostos poliméricos; Magnetismo; Polímeros magnéticos; Cadeias poliméricas; Magnetic polymers; Polymer chains; CIENCIAS EXATAS E DA TERRA::FISICA

Recent research involving magnetic polymers have given very promising results. It is observed in these polymers, the ability to remain magnetized even in the absence of magnetic field which is of great importance to developing new technologies. In order to deepen the knowledge these polymers, in special, its magnetic properties, many researchers have developed theories and methods. In this paper, we use the model developed by Hubbard in 1963. It is a relatively simple model, with important approaches that do not compromise on fundamental analysis, such polymers. With the Hubbard model as a basis, we take a model for the polymer chain in the case of a chain of sub-lattices which one contains the term and the other metal would be the term ligand of the chain. The chain is described as AXBX+1, where A and B are sub-lattices and X gives the size of the chain. We developed this model observing their magnetic properties according to the interaction applied and the number of particles per site building the magnetic phase diagram for different networks AXBX+1.