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Title: Nature and entropy content of the ordering transitions in RCo2
Author: Herrero-Albillos, Julia
Bartolomé, Fernando
García, Luis Miguel
Casanova i Fernàndez, Fèlix
Labarta, Amílcar
Batlle Gelabert, Xavier
Keywords: Materials magnètics
Propietats magnètiques
Estructura electrònica
Magnetic materials
Magnetic properties
Electronic structure
Issue Date: 2006
Publisher: The American Physical Society
Abstract: Differential scanning calorimetry experiments have been performed under magnetic field in R Co 2 Laves phases compounds ( R = Pr , Nd, Tb, Dy, Ho, and Er). The thermodynamical nature of the ferromagnetic transitions in Pr Co 2 and Nd Co 2 is clarified, after the controversy present in the literature about the character of their ordering transitions. The magnetocaloric effect in the compounds showing a first-order magnetostructural transition ( R = Dy , Ho, and Er) is characterized. The latent heat, L , and the entropy change at the transition, Δ S , have been studied by inducing the transition sweeping the temperature at a constant field and sweeping the field at a constant temperature. Results from calorimetric data show that L is essentially temperature independent, suggesting that the first order transitions in R Co 2 are dominated by the structural effects. The magnetocaloric effect has been also characterized from magnetization data and the results are in excellent agreement with those from calorimetric data. However, the corresponding values of Δ S for isothermal and isofield experiments differ significantly. We interpret the differences in terms of the broadness of the transitions and prove that the various Δ S values reported in literature for first-order transitions are not always directly comparable.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 2006, vol. 73, núm. 13, p. 134410-1-134410-10
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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