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Investigation on the magnetocaloric effect in DyNi2, DyAl2 and Tb1−nGdnAl2 (n=0, 0.4, 0.6) compounds |
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| Authors: | V.S.R. de Sousa E.J.R. Plaza B.P. Alho S. Gama P.J. von Ranke |
| Affiliation: | a Instituto de Física Armando Dias Tavares, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier 524, 20550-900 Rio de Janeiro, Brazil. b CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal c Divisão de Metrologia de Materiais, Inmetro, Duque de Caxias, Brazil d Departamento de Ciências Exatas e da Terra, Unifesp, Diadema, Brazil |
| Abstract: | The magnetocaloric effect (MCE) in the DyNi2, DyAl2 and Tb1−nGdnAl2 (n=0, 0.4, 0.6) was theoretically investigated in this work. The DyNi2 and DyAl2 compounds are described considering a model Hamiltonian which includes the crystalline electrical field anisotropy. The anisotropic MCE was calculated changing the magnetic field direction from 〈1 1 1〉 to 〈0 0 1〉 in DyNi2 and from 〈1 0 0〉 to 〈0 1 1〉 in DyAl2. The influence of the second- and first-order spin-reorientation phase transitions on the MCE that occurs in these systems is discussed. For the calculations of the MCE thermodynamic quantities in the Tb1−nGdnAl2 systems we take into account a two sites magnetic model, and good agreement with the available experimental data was obtained. |
| Keywords: | 75.30.Sg 75.10.Dg 75.20.En |
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