AI Article Synopsis
- Interfacing single-unit cell (1 UC) FeSe with TiO or FeO significantly boosts its superconductivity compared to bulk FeSe, primarily due to enhanced interfacial electron-phonon coupling (EPC).
- The introduction of a new interface, 1 UC FeSe/SrVO/SrTiO, shows that the metallic properties of SrVO effectively screen high-energy phonons, which is a first for FeSe/oxide systems while keeping the 1 UC thickness.
- Despite similar doping levels, the new 1 UC FeSe/SrVO interface has a lower pairing temperature (∼ 48 K) than other interfaces, highlighting the complex roles of interfacial EPC and dimensional
Article Abstract
Single-unit cell (1 UC) FeSe interfaced with TiO or FeO exhibits significantly enhanced superconductivity compared to that of bulk FeSe, with interfacial electron-phonon coupling (EPC) playing a crucial role. However, the reduced dimensionality in 1 UC FeSe, which may drive superconducting fluctuations, complicates our understanding of the enhancement mechanisms. We construct a new superconducting interface, 1 UC FeSe/SrVO/SrTiO. Here, the itinerant electrons of highly metallic SrVO films can screen all high-energy Fuchs-Kliewer phonons, including those of SrTiO, making it the first FeSe/oxide system with screened interfacial EPC while maintaining the 1 UC FeSe thickness. Despite comparable doping levels, the heavily electron-doped 1 UC FeSe/SrVO exhibits a pairing temperature ( ∼ 48 K) lower than those of FeSe/SrTiO and FeSe/LaFeO. Our findings disentangle the contributions of interfacial EPC from dimensionality in terms of enhancing in FeSe/oxide interfaces, underscoring the critical importance of interfacial EPC. This FeSe/VO interface also provides a platform for studying interfacial superconductivity.
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