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Magnetic behavior of HfMnMo_3O_(12), a material exhibiting negative thermal expansion

机译：HFMNMO_3O_（12）的磁性行为，呈现负热膨胀的材料

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The compound, HfMnMo_3O_(12), the synthesis of which was reported recently, has been shown to exhibit a structural phase transition from a monoclinic to an orthorhombic form above room temperature (T). It was also reported that this compound exhibits negative thermal expansion (NTE) coefficient in the orthorhombic phase, despite the fact that HfMgMo_3O_(12) does not show this behavior. Here, we report the results of magnetic investigations in the temperature interval 1.8 - 360 K. The results establish that this compound undergoes antiferromagnetic ordering below (T_N=) 7.3 K, presumably from divalent Mn and it is of interest to focus future studies to understand possible role of the magnetism on Mn on NTE. It is to be remarked that heat-capacity deviates from T~3 form in the Neel ordered state. Finally, low-field (100 Oe) magnetic susceptibility shows a jump around 348 K, as a consequence of possible structural transition, as though there is a magnetoelastic coupling. This feature is washed out in 5 kOe, thereby suggesting sensitivity of a such coupling for small applications of magnetic fields - an observation relevant to applications.
机译：最近报道了该化合物HFMNMO_3O_（12），其合成已被证明，从单斜替替氏菌形成在室温（T）上方的单斜形式中，表现出从单斜的结构相转变。还报道了该化合物在正交阶段表现出负热膨胀（NTE）系数，尽管HFMGMO_3O_（12）不显示这种行为。在这里，我们报告了温度间隔1.8-360k的磁性研究结果。结果确定该化合物在低于（T_N =）7.3 k以下进行反铁磁性排序，可能是从Divallent MN，它感兴趣地关注未来的研究来理解磁力对NTE上Mn的可能作用。应据说热量偏离Neel有序状态的T〜3形式。最后，低场（100 oE）磁性易感性显示出跳跃约348 k，因此结构过渡的结果，好像存在磁性耦合。该特征在5个KOE中被清洗，从而提示了这种耦合的敏感性，用于磁场的小型应用 - 与应用相关的观察。

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