Interfacial superconductivity and a Se-vacancy ordered insulating phase in FeSe/PbOx heterostructures
Yunkai Guo, Xuanyu Long, Jingming Yan, Zheng Liu, Qi-Kun Xue, Wei Li
DOI 10.1103/PhysRevB.111.104501 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The discovery of high-temperature superconductivity in FeSe/SrTiO3 has sparked significant interest in exploring superconducting systems with engineered interfaces. Here, using molecular beam epitaxy growth, we successfully fabricate FeSe/PbOx heterostructures and discover superconductivities in three different monolayer FeSe-related interfaces. We observe superconducting gaps of 13–14 meV in the monolayer FeSe films grown on two different phases of PbOx. Moreover, we discover an insulating Fe10Se9 phase with an ordered √5 × √5 Se-vacancy structure. Our first-principles calculation suggests that this insulating phase originates from electronic correlation. Intriguingly, an additional monolayer FeSe film grown on insulating Fe10Se9 also exhibits superconductivity with the gap size of 5 meV. Our results suggest that the work function differences between monolayer FeSe and the substrates, which can induce band bending and charge transfer, are crucial for interfacial superconductivity.
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. | 83 | Pressure not reported | onset |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | onset |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Interfacial superconductivity and a Se-vacancy ordered insulating phase in the FeSe/PbOx heterostructures
similarity 1.00Yunkai Guo et al. · 2025 · arXiv:2502.13857
Source status unknown — claims are unverified
Superconductivity in FeSe Thin Films Driven by the Interplay between Nematic Fluctuations and Spin-Orbit Coupling
similarity 0.95Jian Kang & Rafael M. Fernandes
Source status unknown — claims are unverified
Evolution of High-Temperature Superconductivity from a Low-Tc Phase Tuned by Carrier Concentration in FeSe Thin Flakes
similarity 0.95B. Lei et al.
Source status unknown — claims are unverified
Interlayer coupling of magnetism and electronic structure in two-dimensional superconducting systems: fcc Fe on monolayer FeSe
similarity 0.95Zhao-Feng Ye et al.
Source status unknown — claims are unverified
Electronic structure of Co-substituted FeSe superconductor probed by soft x-ray spectroscopy and density functional theory
similarity 0.95I. Perez et al.
Source status unknown — claims are unverified
Superconductor-Insulator Quantum Phase Transition in Disordered FeSe Thin Films
similarity 0.94R. Schneider et al.
Source status unknown — claims are unverified