High-mobility carriers and superconductivity at the SrNbO3−SrTiO3 interface
Haoran Wei, Shengru Chen, Yuting Zou, Yuxin Wang, Meng Yang, Qinghua Zhang, Ke Zou, Lin Gu, Kun Jiang, Er-Jia Guo, Zhi Gang Cheng
DOI 10.1103/PhysRevB.109.205404 · Physical Review B
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Abstract
Interfaces between transition-metal oxides can host two-dimensional electron gases (2DEGs) that exhibit intriguing quantum phenomena. The interfacial 2DEG system has attracted significant attention due to its versatile properties and tunability. In this study, we present the discovery of a high-mobility 2DEG characterized by well-developed Shubnikov-de Haas oscillations, alongside superconductivity at temperatures below 230 mK, in a heterostructure comprising bulk-metallic SrNbO3 on SrTiO3. The 2DEG is featured with extremely low carrier density for the quantum oscillations, and the superconductivity with two-step behaviors in various transport properties. Both the 2DEG and the superconductivity exhibit a common dependence on the thickness of the SrNbO3 layer. The dependence underscores the crucial role of epitaxial strain within the metallic layer on these two phenomena. Our findings introduce a novel platform for investigating interfacial high-mobility 2DEGs coexisting with superconductivity, with the bulk-metallic components of SrNbO3 playing a pivotal role in these heterostructures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrNbO3/SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.23 | Pressure not reported | onset |
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