Many experiments investigating magnetic-field tuned superconductor-insulator transition (H-SIT) often exhibit low-temperature resistance saturation, which is interpreted as an anomalous metallic phase emerging from a ‘failed superconductor’, thus challenging conventional theory. Here we study a random granular array of indium islands grown on a gateable layer of indium-oxide. By tuning the intergrain couplings, we reveal a wide range of magnetic fields where resistance saturation is observed, under conditions of careful electromagnetic filtering and within a wide range of linear response. Exposure to external broadband noise or microwave radiation is shown to strengthen the tendency of superconductivity, where at low field a global superconducting phase is restored. Increasing magnetic field unveils an ‘avoided H-SIT’ that exhibits granularity-induced logarithmic divergence of the resistance/conductance above/below that transition, pointing to possible vestiges of the original emergent duality observed in a true H-SIT. We conclude that anomalous metallic phase is intimately associated with inherent inhomogeneities, exhibiting robust behavior at attainable temperatures for strongly granular two-dimensional systems.

许多研究磁场调谐的超导体-绝缘体转变（H-SIT）的实验通常会表现出低温电阻饱和，这被解释为是由“失效的超导体”出现的异常金属相，因此对传统理论提出了挑战。在这里，我们研究了在可栅氧化铟层上生长的铟岛的随机颗粒阵列。通过调整晶粒间耦合，我们揭示了在仔细的电磁滤波和线性响应范围内观察到电阻饱和的宽范围磁场。研究表明，暴露于外部宽带噪声或微波辐射会增强超导性的趋势，在这种情况下，低电场下会恢复全局超导相。不断增加的磁场揭示了一种“避免的H-SIT”，其在过渡过程的上方/下方显示出粒度引起的电阻/电导的对数散度，这表明在真实的H-SIT中观察到的原始紧急对偶性可能存在痕迹。我们得出的结论是，异常金属相与固有的不均匀性密切相关，在强颗粒二维系统的可达到温度下表现出强大的行为。