O modelo de Baxter-WU Spin-1

• Ano de defesa: 2005
• Autor(a) principal: Maria Lucia de Morais Costa
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Baxter-WU; spin-1; Transição de fase; Renormalização (Fisica); Física
• Link de acesso: http://hdl.handle.net/1843/ESCZ-6L6NQ9

We have studied the critical, multicritical and first order behavior of the Spin-1 Baxter-Wu model in a crystal field. We have employed the mean field renormalization group approach and extensive Monte Carlo simulations using the single spin flip Metropolis algorithm and hystogram techniques. The global phase diagram is obtained and it is shown that the system belongs to the same universality class as the corresponding spin-1/2 version and presents a multicritical point separating a second order phase transition line from a first order line. The probability distribution of this pentacritical point is also determined.