La（Fe，Mn，Si）_（13）一级性质的测定
Determining the First Order Character of La(Fe,Mn,Si)13
摘要：
磁热磁转变的一阶特征的连续确定仍然是难以捉摸的。在这里，我们使用微量热技术在两种模式下的操作，以确定从潜热和热容量分别在一组工程的La（Fe，Mn，Si）13样品的熵变的贡献。我们比较使用磁力测定法确定的那些通过这种方法提取的属性，并提出了一个模型独立的参数，将允许在不同的材料家族的程度的一阶字符定义。微量热法是足够敏感的，以允许在低场热容与Mn的存在下，在这些样品中观察到一个额外的峰值功能。该特征是磁性起源，但对磁场不敏感，可以解释为在晶格内Mn的不均匀占据导致反铁磁有序Mn簇。
英文摘要：
Definitive determination of first order character of the magnetocaloric magnetic transition remains elusive. Here we use a microcalorimetry technique in two modes of operation to determine the contributions to entropy change from latent heat and heat capacity separately in an engineered set of La(Fe, Mn, Si)13 samples. We compare the properties extracted by this method with those determined using magnetometry and propose a model independent parameter that would allow the degree of first order character to be defined across different families of materials. The microcalorimetry method is sufficiently sensitive to allow observation of an additional peak feature in the low field heat capacity associated with the presence of Mn in these samples. The feature is of magnetic origin but is insensitive to magnetic field, explicable in terms of inhomogeneous occupancy of Mn within the lattice resulting in antiferromagnetic ordered Mn clusters.
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