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

Milan Bratko; Kelly Morrison; Ariana de Campos; Sergio Gama; Lesley F. Cohen; Karl G. Sandeman

doi:10.1063/1.4729893

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

Strongly Correlated Electrons 2012-09-25 v1 Materials Science

Authors: Milan Bratko , Kelly Morrison , Ariana de Campos , Sergio Gama , Lesley F. Cohen , Karl G. Sandeman

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Abstract

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.

Keywords

magnetocaloric effect history dependence (Mn, Fe)As direct calorimetric measurement Maxwell relation mixed-phase state first order transition

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@article{arxiv.1206.2540,
  title  = {History dependence of directly observed magnetocaloric effects in (Mn, Fe)As},
  author = {Milan Bratko and Kelly Morrison and Ariana de Campos and Sergio Gama and Lesley F. Cohen and Karl G. Sandeman},
  journal= {arXiv preprint arXiv:1206.2540},
  year   = {2012}
}

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4 pages, 2 figures

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

Abstract

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