The origin of magnetism in metals has been traditionally discussed in two diametrically opposite limits: itinerant and local moments. Surprisingly, there are very few known examples of materials that are close to the itinerant limit, and their properties are not universally understood. In the case of the two such examples discovered several decades ago, the itinerant ferromagnets ZrZn2 and Sc3In, the understanding of their magnetic ground states draws on the existence of 3d electrons subject to strong spin fluctuations. Similarly, in Cr, an elemental itinerant antiferromagnet with a spin density wave ground state, its 3d electron character has been deemed crucial to it being magnetic. Here, we report evidence for an itinerant antiferromagnetic metal with no magnetic constituents: TiAu. Antiferromagnetic order occurs below a Néel temperature of 36 K, about an order of magnitude smaller than in Cr, rendering the spin fluctuations in TiAu more important at low temperatures. This itinerant antiferromagnet challenges the currently limited understanding of weak itinerant antiferromagnetism, while providing insights into the effects of spin fluctuations in itinerant-electron systems.

中文翻译：

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不含磁性成分的流动性反铁磁性金属。

传统上已经在两个截然相反的限制中讨论了金属中磁性的起源：流动力矩和局部力矩。出人意料的是，几乎没有已知的材料的例子接近于流动剂的极限，并且其性质尚未得到普遍理解。以几十年前发现的两个这样的例子为例，流动铁磁体ZrZn2和Sc3In，对它们的磁性基态的理解依赖于3d电子存在的自旋波动。类似地，在具有自旋密度波基态的元素迭代反铁磁体Cr中，其3d电子特性被认为对它的磁性至关重要。在这里，我们报告了一种没有磁性成分的流动性反铁磁性金属的证据：TiAu。Néel温度低于36 K时，反铁磁序发生，大约比Cr小一个数量级，从而使TiAu中的自旋涨落在低温下更为重要。这种巡回反铁磁体挑战了目前对弱巡回反铁磁性的有限理解，同时提供了对巡回电子系统中自旋涨落的影响的见解。