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Título

Field dependence of the adiabatic temperature change in second order phase transition materials: Application to Gd

AutorFranco, V. ; Conde Amiano, Alejandro; Romero-Enrique, J. M.; Spichkin, Y. I.; Tishin, A. M.; Zverev, V. I.
Palabras claveMagnetocaloric effects
Curie temperature
Entropy
Magnetic transitions
Fecha de publicación19-nov-2009
EditorAmerican Institute of Physics
CitaciónJournal of Applied Physics 106: 103911 (2009)
ResumenThe field dependence of the adiabatic temperature change Tad of second order phase transition materials is studied, both theoretically and experimentally. Using scaling laws, it is demonstrated that, at the Curie temperature, the field dependence of Tad is characterized by H1/. Therefore, as the magnetic entropy change SM follows a H(1−)/ power law, these two dependencies coincide only in the case of a mean field model. A phenomenological construction of a universal curve for Tad is presented, and its theoretical justification is also given. This universal curve can be used to predict the response of materials in different conditions not available in the laboratory (extrapolations in field or temperature), for enhancing the resolution of the data and as a simple screening procedure for the characterization of materials
Versión del editorhttp://dx.doi.org/10.1063/1.3261843
URIhttp://hdl.handle.net/10261/21813
DOI10.1063/1.3261843
ISSN0021-8979
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