Magnetic and barocaloric effect in physical systems with two energy levels / Efeitos magnetocalórico e barocalórico em sistemas físicos com dois níveis de energia

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

In this work we study the theoretical aspects of the magnetocaloric and barocaloric effect in simple physical systems with two and four energy levels. In order to do that, we used a Hamiltonian that consider local magnetic moments interacting among them and with an external magnetic field.We include in the Hamiltonian the magnetoelastic interaction, and an extra term to simulate anisotropy. We consider the external pressure effect using a renormalization of the interaction exchange parameter. We performed systematical study about the magnetocaloric and barocaloric properties for a lot of sets of model parameters. The results show different types of behavior of the magnetocaloric potentials, such as the table-like effect, the inverse effect, the giant effect and a structure with two peaks.

ASSUNTO(S)

refrigeração magnética efeito barocalórico fisica da materia condensada sistema de dois níveis magnetic refrigeration two levels system systematic study barocaloric effect efeito magnetocalórico magnetocaloric effect anisotropic magnetocaloric effect estudo sistemático efeito magnetocalórico anisotrópico

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