Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO3

@article{Wang2012InterfaceInducedHS,
  title={Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO3},
  author={Qing-Yan Wang and Zhi Li and Wen-Hao Zhang and Zuocheng Zhang and Jin-song Zhang and Wei Li and Hao Ding and Yunbo Ou and Peng Deng and Kai-Kuen Chang and Jing Wen and Canli Song and Ke He and Jin-Feng Jia and Shuai-hua Ji and Yayu Wang and Lili Wang and Xi Chen and Xucun Ma and Qi-Kun Xue},
  journal={Chinese Physics Letters},
  year={2012},
  volume={29},
  pages={037402}
}
We report high transition temperature superconductivity in one unit-cell (UC) thick FeSe films grown on a Se-etched SrTiO3 (001) substrate by molecular beam epitaxy (MBE). A superconducting gap as large as 20 meV and the magnetic field induced vortex state revealed by in situ scanning tunneling microscopy (STM) suggest that the superconductivity of the 1 UC FeSe films could occur around 77 K. The control transport measurement shows that the onset superconductivity temperature is well above 50 K… Expand

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References

SHOWING 1-10 OF 17 REFERENCES
Molecular-beam epitaxy and robust superconductivity of stoichiometric FeSe crystalline films on bilayer graphene
We report on molecular beam epitaxy growth of stoichiometric and superconducting FeSe crystalline thin films on double-layer graphene. Layer-by-layer growth of high-quality films has been achieved in… Expand
Superconductivity in the iron selenide K x Fe 2 Se 2 (0≀x≀1.0)
We report the superconductivity at above 30 K in a FeSe-layer compound K0.8Fe2Se2 (nominal composition) achieved by metal K intercalating in between FeSe layers. It is isostructural to BaFe2As2 and… Expand
Direct Observation of Nodes and Twofold Symmetry in FeSe Superconductor
TLDR
The electron-pairing mechanism in an iron-based superconductor, iron selenide (FeSe), is investigated using scanning tunneling microscopy and spectroscopy and the anisotropy can be explained in terms of the orbital-dependent reconstruction of electronic structure in FeSe. Expand
Macroscopic superconducting current through a silicon surface reconstruction with indium adatoms: Si(111)-(√7 Γ— √3)-In.
TLDR
Macroscopic and robust supercurrents are observed by direct electron transport measurements on a silicon surface reconstruction with In adatoms and the temperature dependence of J(2D,c) indicates that the surface atomic steps play the role of strongly coupled Josephson junctions. Expand
Electronic and magnetic phase diagram of beta-Fe(1.01)Se with superconductivity at 36.7 K under pressure.
TLDR
The magnetic and electronic phase diagram of beta-Fe(1.01)Se is reported, which shows a marked change in volume at the same time as T(C) rises, owing to a collapse of the separation between the Fe(2)Se(2), and it is reported that at higher pressures, Fe(1)Se transforms to a hexagonal NiAs-type structure and exhibits non-magnetic behaviour. Expand
Superconductivity in the PbO-type structure Ξ±-FeSe
  • F. Hsu, J. Luo, +8 authors Maw-Kuen Wu
  • Materials Science, Medicine
  • Proceedings of the National Academy of Sciences
  • 2008
TLDR
The observation of superconductivity with zero-resistance transition temperature at 8 K in the PbO-type Ξ±-FeSe compound is reported, indicating that this compound has the same, perhaps simpler, planar crystal sublattice as the layered oxypnictides. Expand
Possible highTc superconductivity in the Baβˆ’Laβˆ’Cuβˆ’O system
Metallic, oxygen-deficient compounds in the Baβˆ’Laβˆ’Cuβˆ’O system, with the composition BaxLa5βˆ’xCu5O5(3βˆ’y) have been prepared in polycrystalline form. Samples withx=1 and 0.75,y>0, annealed below 900Β°C… Expand
Doubling the critical temperature of La1.9Sr0.1CuO4 using epitaxial strain
The discovery of high-temperature superconductivity in copper oxides raised the possibility that superconductivity could be achieved at room temperature. But since 1993, when a critical temperature… Expand
Superconducting Interfaces Between Insulating Oxides
TLDR
This work reports on superconductivity in the electron gas formed at the interface between two insulating dielectric perovskite oxides, LaAlO3 and SrTiO3. Expand
Superconducting Properties of a Stoichiometric FeSe Compound and Two Anomalous Features in the Normal State
This paper reports the synthesis and superconducting behaviors of the tetragonal iron-chalcogenide superconductor FeSe. The electrical resistivity and magnetic moment measurements confirmed its… Expand
...
1
2
...