Banca de DEFESA: CACIANO SOARES COSTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : CACIANO SOARES COSTA
DATA : 17/02/2017
HORA: 10:00
LOCAL: AUDITÓRIO DO DFTE
TÍTULO:

The Blume-Capel Model in a Gaussian Random Field

PALAVRAS-CHAVES:

Theory mean field; Phase diagrams; Tricritical behavior.

PÁGINAS: 78
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física da Matéria Condensada
RESUMO:

In this work we investigate the infinite ranged Blume-Capel model (BC), under a random field following a Gaussian distribution. The model is exactly soluble and from the corresponding free energy density we have obtained a wealthy of phase diagrams. We initially revisit the BC model under a uniform crystal field and in zero magnetic field. This allowed us to regain the well-known mean-field results for this model. In the next step we revised the Kaufman-Kanner work on the BC model under a bimodal random magnetic field and uniform crystal field. In the case we paid special attention to crystal field versus temperature phase diagrams.

Finally, we investigated the phase diagrams for the Gaussian random field case. The obtained phase diagrams display a rich variety of critical phenomena, with the presence of tricritical points, in some cases, related to the occurrence of  both frist-oder and continuous transition lines.     

MEMBROS DA BANCA:
Presidente - 1174332 - FRANCISCO ALEXANDRE DA COSTA
Interno - 2492756 - JOAO MEDEIROS DE ARAUJO
Interno - 6346140 - LUCIANO RODRIGUES DA SILVA
Externo à Instituição - GISLENE MICARLA BORGES DE LIMA - UFPE