Many unconventional superconductors exhibit a common set of anomalous charge transport properties that characterize them as ‘strange metals’, which provides hope that there is a single theory that describes them^1,2,3. However, model-independent connections between the strange metals and superconductivity have remained elusive. Here, we show that the Hall effect of the unconventional superconductor BaFe₂(As_1−xP_x)₂ contains an anomalous contribution arising from the correlations within the strange metal. This term has a distinctive dependence on the magnetic field, which allows us to track its behaviour across the doping–temperature phase diagram, even under the superconducting dome. These measurements demonstrate that the strange metal Hall component emanates from a quantum critical point and, in the zero-temperature limit, decays together with the superconducting critical temperature. This empirically reveals the structure of the connection between superconductivity and quantum criticality, which may be common to the physics of many strange metal superconductors.

许多非常规超导体表现出共同的异常电荷传输性质，这些性质将它们表征为“奇怪的金属”，这提供了希望有一个单一的理论来描述它们^1,2,3。但是，奇怪的金属之间的模型无关连接和超导性仍然难以捉摸。在这里，我们证明了非常规超导体BaFe ₂（As _{1- x} P _x）₂的霍尔效应包含由奇怪金属内部的相关性引起的异常贡献。该术语对磁场有独特的依赖性，即使在超导圆顶下，它也使我们能够在掺杂-温度相图中跟踪其行为。这些测量结果表明，奇怪的金属霍尔成分从量子临界点散发出来，并且在零温度范围内与超导临界温度一起衰减。这从经验上揭示了超导性和量子临界性之间联系的结构，这可能是许多奇怪的金属超导体的物理现象所共有的。