Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/24162
Title: Change in entropy at a first-order magnetoelastic phase transition: Case study of Gd5(SixGe1-x)4 giant magnetocaloric alloys
Author: Casanova i Fernàndez, Fèlix
Batlle Gelabert, Xavier
Labarta, Amílcar
Marcos, Jordi
Mañosa, Lluís
Planes Vila, Antoni
Keywords: Propietats magnètiques
Magnetic properties
Issue Date: 15-May-2003
Publisher: American Institute of Physics
Abstract: The change in entropy, ΔS, at the first-order magnetoelastic phase transition in Gd5(SixGe1−x)4 alloys for x⩽0.5 has been measured with a high-sensitivity differential scanning calorimeter with built-in magnetic field, H. Scaling of ΔS is achieved by changing the transition temperature, Tt, with x and H from 70 to 310 K. Tt is thus the relevant parameter in determining the giant magnetocaloric effect in these alloys. The calorimetric determination of the change in entropy is also in agreement with the indirect calculation obtained from the magnetization curves measured up to 23 T using both the Clausius–Clapeyron equation and the Maxwell relation. A simple phenomenological model based on the magnetization curves accounts for these results.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1063/1.1556274
It is part of: Journal of Applied Physics, 2003, vol. 93, núm. 10, p. 8313-8315
Related resource: http://dx.doi.org/10.1063/1.1556274
URI: http://hdl.handle.net/2445/24162
ISSN: 0021-8979
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Física de la Matèria Condensada)

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