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|Type:||Artigo de periódico|
|Title:||Magnetocaloric Effect: Overcoming The Magnetic Limit|
|Abstract:||We have studied anomalous peaks observed in magnetocaloric -ΔS(T) curves for systems that undergo first-order magnetostructural transitions. The origin of those peaks, which can exceed the conventional magnetic limit, R ln(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 5Si 2Ge 2- and MnAs-based systems, obtaining excellent results for the observed magnetocaloric effect. © 2008 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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