| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1803219 | Journal of Magnetism and Magnetic Materials | 2009 | 4 Pages |
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 Gd5Si2Ge2- and MnAs-based systems, obtaining excellent results for the observed magnetocaloric effect.
Related Topics
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Condensed Matter Physics
Authors
E.J.R. Plaza, J.C.P. Campoy,