Universidade Federal do Piauí

Evento: Ising model S=1, 3/2 and 2 on directed networks

Local: Auditório do DF (14:15 h)

Data: 26/03/2009

Prof. Dr. Francisco Welington de Sousa Lima (Professor do DF-UFPI)

Abstract:

Using Monte Carlo simulations we study the Ising model with spin S = 1, 3/2, and 2 on  directed Barabási-Albert and small-world networks. In this model, the order-disorder phase transition of the order parameter is well defined on small-world networks for Ising model with spin S = 1, 3/2, and 2. We  calculate the value of the critical temperature Tc for several values of rewiring probability p of the  directed small-world network. For  directed small-world networks we obtained a second-order phase transition for p=0.2 and first-order phase transition for p=0.8. The critical exponents b /n g /n and 1/n were calculated for p=0.2. On i directed Barabási-Albert  we show that phase transition do not exist for Ising model with spin S = 1, 3/2, and 2 .