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.
参考文献
| [1] | H. Wada;Y. Tanabe .Giant magnetocaloric effect of MnAs_(1-x)Sb_(x)[J].Applied physics letters,2001(20):3302-3304. |
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