Produção Nacional
Ferromagnetic Potts model under an external magnetic field: An exact renormalization group approach
2006; American Physical Society; Volume: 74; Issue: 9 Linguagem: Inglês
10.1103/physrevb.74.094432
ISSN1550-235X
AutoresS. Coutinho, Welles A. M. Morgado, Evaldo M. F. Curado, Ladário da Silva,
Tópico(s)Physics of Superconductivity and Magnetism
ResumoThe q-state ferromagnetic Potts model under a non-zero magnetic field coupled with the 0^th Potts state was investigated by an exact real-space renormalization group approach. The model was defined on a family of diamond hierarchical lattices of several fractal dimensions d_F. On these lattices, the renormalization group transformations became exact for such a model when a correlation coupling that singles out the 0^th Potts state was included in the Hamiltonian. The rich criticality presented by the model with q=3 and d_F=2 was fully analyzed. Apart from the Potts criticality for the zero field, an Ising-like phase transition was found whenever the system was submitted to a strong reverse magnetic field. Unusual characteristics such as cusps and dimensional reduction were observed on the critical surface.
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