TITLE

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

AUTHOR(S)
Balli, Mohamed; Fruchart, Daniel; Gignoux, Damien; Zach, Ryszard
PUB. DATE
August 2009
SOURCE
Applied Physics Letters;8/17/2009, Vol. 95 Issue 7, p072509
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
43887416

 

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