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. 
Milan Bratko, Kelly Morrison, Ariana de Campos, Sergio Gama, Lesley F.   Cohen, Karl G. Sandeman
cond-mat.str-el cond-mat.mtrl-sci