Estudo de sistemas magnéticos utilizando técnicas de grupos de renormalização fenomenológicos

Abstract

The thermodynamic properties of spin models on the lattice have been studied by employing phenomenological renormalization group techniques. The spin-1 Blume- Capel model and the spin-1 and spin-3/2 Baxter-Wu model have been treated. The Blume Capel model with spin-1, in its diluted version, on the simple cubic lattice has been studied by using the mean field renormalization group in the pair aproximation. We have obtained the critical temperature as a function of the vacant sites concentration as well a function of the crystal field anisotropy. We consider exchange e superexchange interactions between Fe atoms induzed by Al atoms and applied this model to FeAl alloys to describe its thermodynamics properties. We also studied the spin-1 and 3/2 Baxter-Wu model in a crystal field by employing the finite size renormalization group approach. The eigenvalues of the transfer matrix have been computed in order to get the corresponding phase diagram. Estimates of the firstand second-order transition temperatures have been obtained, as well as multicritical points, critical exponents and central charges, the latter two being obtained for some values of the crystal field. The Gibbs phase rule has been used to check the consistency of the phase diagram of some magnetic models, including those treated in this work. In this case it is necessary to take into account the symmetries carried by the magnetic Hamiltonians.