Granular metallicity as a minimal normal state for superconductivity
Mingyang Qin, Xingyu Jiang, Liping Zhang, Ruozhou Zhang, Fucong Chen, Juan Xu, Zhongxu Wei, Peiyu Xiong, Xu Zhang, Li Xu, Jie Yuan, Beiyi Zhu, Qihong Chen, Brigitte Leridon, Kui Jin, Zhongxian Zhao
DOI 10.1103/PhysRevB.104.174511 · Physical Review B
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Abstract
We report the evolution of electrical transport properties in insulating FeSe films with electron doping induced by the ionic liquid gating technique. Superconductivity never emerges in the strong insulators with variable-range hopping behavior but is shown to arise once the resistance of the normal state varies as ln(1/T), indicating that this behavior corresponds to the minimal conducting character for developing superconductivity. Our work points toward granular metallicity for the ln(1/T) behavior, suggesting that the emergence of superconductivity requires at least an insulating state containing metallic granules. Moreover, it unravels an electronic segregation in proximity to superconductor-insulator transition, which calls for a comprehensive understanding of this segregated phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
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