Robust anomalous metallic states and vestiges of self duality in two-dimensional granular In-InOx composites
| Autor: | Zhang, Xinyang, Hen, Bar, Palevski, Alexander, Kapitulnik, Aharon |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | npj Quantum Mater. 6, 30 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41535-021-00329-2 |
| Popis: | 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. Comment: 14 pages, 12 figures; after minor revision and error corrections |
| Databáze: | arXiv |
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