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Marginal breakdown of the Fermi-liquid state on the border of metallic ferromagnetism

机译：金属铁磁性边界上费米液态的边际破坏

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摘要

For the past half century, our understanding of how the interactions between electrons affect the low-temperature properties of metals has been based on the Landau theory of a Fermi liquid. In recent times, however, there have been an increasingly large number of examples in which the predictions of the Fermi-liquid theory appear to be violated. Although the qualitative reasons for the breakdown are generally understood, the specific quantum states that replace the Fermi liquid remain in many cases unclear. Here we describe an example of such a breakdown where the non-Fermi-liquid properties can be interpreted. We show that the thermal and electrical resistivities in high-purity samples of the d-electron metal ZrZn_2 at low temperatures have T and T~(6/3) temperature dependences, respectively: these are the signatures of the 'marginal' Fermi-liquid state, expected to arise from effective long-range spin-spin interactions in a metal on the border of metallic ferromagnetism in three dimensions. The marginal Fermi liquid provides a link between the conventional Fermi liquid and more exotic non-Fermi-liquid states that are of growing interest in condensed matter physics. The idea of a marginal Fermi liquid has also arisen in other contexts-for example, in the phenomenology of the normal state of the copper oxide superconductors, and in studies of relativistic plasmas and of nuclear matter.
机译：在过去的半个世纪中，我们对电子之间的相互作用如何影响金属的低温特性的理解一直基于费米液体的朗道理论。但是，近年来，越来越多的例子似乎违反了费米液体理论的预测。尽管通常会理解击穿的定性原因，但在许多情况下仍不清楚替代费米液体的特定量子态。在这里，我们描述了这种分解的例子，其中非费米液体性质可以被解释。我们表明，d电子金属ZrZn_2的高纯度样品在低温下的热阻和电阻率分别具有T和T〜（6/3）温度依赖性：这是“边缘”费米液体的特征状态，预计是由于金属铁磁性边界上的金属在三个维度上有效的远距离自旋相互作用产生的。边际费米液体提供了常规费米液体与更奇特的非费米液体状态之间的联系，在冷凝物物理学中，这种状态越来越引起人们的兴趣。在其他情况下，例如在氧化铜超导体正常状态的现象学以及相对论等离子体和核物质的研究中，也出现了边缘费米液体的想法。

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