The influence of the quadrupolar interaction in the magnetocaloric effect

Using a model Hamiltonian, which takes into account the dipolar and quadrupolar interaction within the molecular field approximation, it was possible to investigate the influence of a magnetic phase transition on the magnetocaloric potential. The results obtained show that discontinuous changes in t...

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Bibliographic Details
Published in:Solid state communications 2000-01, Vol.114 (9), p.487-491
Main Authors: de Oliveira, I.G, Caldas, A, Nobrega, E.P, de Oliveira, N.A, von Ranke, P.J
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
D. Heat capacity
D. Phase transitions
D. Thermodynamic properties
Exact sciences and technology
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetocaloric effect, magnetic cooling
Physics
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Summary:Using a model Hamiltonian, which takes into account the dipolar and quadrupolar interaction within the molecular field approximation, it was possible to investigate the influence of a magnetic phase transition on the magnetocaloric potential. The results obtained show that discontinuous changes in the order parameters associated with the first-order phase transition involve a strong enhancement in magnetocaloric potential (which has practical importance for magnetic refrigeration efficiency) at the critical temperature. These results were fully discussed and correlated with the Maxwell thermodynamic relations.
ISSN:0038-1098
1879-2766
DOI:10.1016/S0038-1098(00)00096-X