The compound MnAs0.9P0.1 exhibits a multistep magnetic order-order transition from a helimagnetic γ-phase with Hα-type magnetic order to a ferromagnetic β-phase at 80 K and then to a helimagnetic α-phase at 203 K. The γ-β transition exhibits the characteristics of a first-order transition with a thermal hysteresis as large as 6 K, while the β-α transition is of second order with a thermal hysteresis smaller than 2 K and without magnetic hysteresis. With these two successive helimagnetism-related transitions, magnetic-entropy changes of -2.1 J/(kg•K) at 203~K for a field change from 0 to 5 T and 0.1 J/(kg•K) at 83 K for a field change from 0 to 1 T are obtained. Investigation of the magnetocaloric effect associated with a transition from Hα-type magnetic order to FM order may open a new route to explore candidates for magnetic refrigeration.
XUN Ai-Kun
,
LIU Feng
,
GAO Yi-Bo
,
LIU Jin-Jun
. Magnetic transitions and magnetocaloric effect in MnAs0.9P0.1[J]. Acta Metallurgica Sinica (English Letters), 2012
, 25(1)
: 76
-80
.
DOI: 10.11890/1006-7191-121-76
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