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History dependence of directly observed magnetocaloric effects in (Mn, Fe)As

We use a calorimetric technique operating in sweeping magnetic field to study the thermomagnetic history- dependence of the magnetocaloric effect (MCE) in Mn0.985Fe0.015As. We study the magnetization history for which a "colossal" MCE has been reported when inferred indirectly via a Maxwell relation. We observe no colossal effect in the direct calorimetric measurement. We further examine the impact of mixed-phase state on the MCE and show that the first order contribution scales linearly with the phase fraction. This validates various phase-fraction based methods developed to remove the colossal peak anomaly from Maxwell-based estimates.

preprint2012arXivOpen access
Milan BratkoKelly MorrisonAriana de CamposSergio GamaLesley F. CohenKarl G. Sandeman
cond-mat.str-elcond-mat.mtrl-sci
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Milan BratkoKelly MorrisonAriana de CamposSergio GamaLesley F. CohenKarl G. Sandeman

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