History dependence of directly observed magnetocaloric effects in (Mn, Fe)As
History dependence of directly observed magnetocaloric effects in (Mn, Fe)As
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DOI：
10.1063/1.4729893
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发表时间：
2012-06
影响因子：
4
通讯作者：
M. Bratko;K. Morrison;A. D. Campos;S. Gama;L. Cohen;K. G. Sandeman
中科院分区：
文献类型：
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作者：
M. Bratko;K. Morrison;A. D. Campos;S. Gama;L. Cohen;K. G. Sandeman
利用量热技术研究了Mn_（0.985）Fe_（0.015）As的磁热效应与热磁历史的关系。我们研究的磁化历史的"巨大的" MCE已被报道时，间接推断通过麦克斯韦关系。我们在直接量热测量中没有观察到巨大效应。我们进一步研究了混合相态对MCE的影响，并表明一阶贡献与相分数呈线性关系。这验证了各种相分数为基础的方法，以消除巨大的峰值异常麦克斯韦为基础的估计。
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.