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Type: Artigo de periódico
Title: Magnetocaloric effect: Overcoming the magnetic limit
Author: Plaza, EJR
Campoy, JCP
Abstract: We have studied anomalous peaks observed in magnetocaloric -Delta S(T) curves for systems that undergo first-order magnetostructural transitions. The origin of those peaks, which can exceed the conventional magnetic limit, Rln(2J+1), is discussed on thermodynamic bases by introducing an additional-exchange contribution (due to exchange constant variation arising from magnetostructural transition). We also applied a semiphenomenological model to include this additional-exchange contribution in Gd(5)Si(2)Ge(2) and MnAs-based systems, obtaining excellent results for the observed magnetocaloric effect. (c) 2008 Elsevier B. V. All rights reserved.
Subject: Magnetocaloric effect
Exchange entropy
Entropy magnetic limit
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2008.10.001
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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