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|Type:||Artigo de periódico|
|Title:||Magnetocaloric effect: Overcoming the magnetic limit|
|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.|
Entropy magnetic limit
|Editor:||Elsevier Science Bv|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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