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Entropy change and magnetocaloric effect in Gd5(SixGe1-x)4
Casanova i Fernàndez, Fèlix; Batlle Gelabert, Xavier; Labarta, Amílcar; Marcos, Jordi; Mañosa, Lluís; Planes Vila, Antoni
Universitat de Barcelona
Isothermal magnetization curves up to 23 T have been measured in Gd5Si1.8Ge2.2. We show that the values of the entropy change at the first-order magnetostructural transition, obtained from the Clausius-Clapeyron equation and the Maxwell relation, are coincident, provided the Maxwell relation is evaluated only within the transition region and the maximum applied field is high enough to complete the transition. These values are also in agreement with the entropy change obtained from differential scanning calorimetry. We also show that a simple phenomenological model based on the temperature and field dependence of the magnetization accounts for these results.
2010-05-04
Entropia
Magnetostricció
Transformacions de fase (Física estadística)
Entropy
Magnetostriction
Phase transformations (Statistical physics)
(c) The American Physical Society, 2002
Article
The American Physical Society
         

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