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Article Dans Une Revue Applied Physics Letters Année : 2009

The "colossal" magnetocaloric effect in Mn1-xFexAs: What we are really measuring?

Mohamed Balli
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Damien Gignoux
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R. Zach
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Résumé

Recently, a so-called "colossal" magnetocaloric effect (MCE) was reported in Mn1−xFexAs [ A. de Campos et al., Nat. Mater. 5, 802 (2006) ]. However, the value of ΔS that was determined appears markedly overestimated since it results from the inadequate use of the Maxwell relation. Here, we report on recent measurements of ΔS in Mn1−xFexAs from which a correct MCE value is deduced by using the Clausius-Clapeyron equation. This result is asserted by careful use of the Maxwell relation.
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Dates et versions

hal-00686008 , version 1 (06-04-2012)

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Mohamed Balli, Daniel Fruchart, Damien Gignoux, R. Zach. The "colossal" magnetocaloric effect in Mn1-xFexAs: What we are really measuring?. Applied Physics Letters, 2009, 95 (7), pp.072509. ⟨10.1063/1.3194144⟩. ⟨hal-00686008⟩

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