TITLE

The origin of large overestimation of the magnetic entropy changes calculated directly by Maxwell relation

AUTHOR(S)
Weibin Cui; Wei Liu; Zhidong Zhang
PUB. DATE
May 2010
SOURCE
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p222509
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
By investigating the nature of the first-order magnetostructural phase transition, we point out the origin of large overestimation of magnetic entropy changes calculated by directly applying the Maxwell relation. Furthermore, if the mass variations in ferromagnetic and paramagnetic phases on temperature are taken into consideration in two-phase region, taking MnAsCx, (Mn, Al)As, and Mn0.994Fe0.004As compounds as example, based on the modified Maxwell relation, the large overestimation and discrepancy of magnetic entropy changes disappear. The magnetic entropy changes are equivalent with the values by Clausius–Claperyon equation, indicating the validity of this modified approach.
ACCESSION #
51227005

 

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