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Universal behavior for magnetic entropy change in magnetocaloric materials: An analysis on the nature of phase transitions

 

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Opened Access Universal behavior for magnetic entropy change in magnetocaloric materials: An analysis on the nature of phase transitions
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Author: Franco García, Victorino
Bonilla, Claudia Marcela
Herrero Albillos, Julia
Department: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Date: 2010-06-16
Published in: Physical Review B, 81, 224424
Document type: Article
Abstract: A universal curve for the change in the magnetic entropy has been recently proposed for materials with second-order phase transitions. In this work we have studied the universal behavior of the magnetocaloric effect in the family of cobalt Laves phases, RCo2, and mixed manganites, La2/3(CaxSr(1−x))1/3MnO3, which exhibit first- and second-order phase transitions. The rescaled magnetic entropy change curves for different applied fields collapse onto a single curve for materials with second-order phase transition as opposed to the first-order phase transition compounds, for which this collapse does not hold. This result suggests that the universal curve may be used as a further criterion to distinguish the order of the phase transition.
Size: 1.159Mb
Format: PDF

URI: http://hdl.handle.net/11441/33656

DOI: http://dx.doi.org/10.1103/PhysRevB.81.224424

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