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The magnetocaloric effect in materials with a second order phase transition: Are T C and T peak necessarily coincident?

 

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Opened Access The magnetocaloric effect in materials with a second order phase transition: Are T C and T peak necessarily coincident?
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Author: Conde Amiano, Alejandro
Franco García, Victorino
Kuz'min, Michael D.
Romero Enrique, José Manuel
Department: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Date: 2009
Published in: Journal of Applied Physics, 105 (07A917)
Document type: Article
Abstract: Using the Arrott–Noakes equation of state it is shown that the Curie point TC and the temperature where the magnetic entropy change is maximum Tpeak coincide only in the mean field approximation, but the Heisenberg model implies that Tpeak TC even for homogeneous materials. The distance between Tpeak and TC increases with applied magnetic field following a power law. In both cases, TC corresponds to a singular point in the temperature dependence of the magnetic entropy change. The field dependence of the magnetic entropy change is exactly the same at the Curie temperature and at the temperature of the peak.
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URI: http://hdl.handle.net/11441/33238

DOI: http://dx.doi.org/10.1063/1.3063666

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