Superconductivity of single unit cell FeSe/SrTiO3(001): Substrate-surface superstructure dependence
Tomoaki Tanaka, Kenta Akiyama, Ryo Yoshino, Toru Hirahara
DOI 10.1103/PhysRevB.98.121410 · Physical Review B
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Abstract
We report the relationship between the surface superstructure of SrTiO3(001) (STO) substrates and the superconducting properties of single unit cell (1-UC) FeSe films using scanning tunneling microscopy/spectroscopy (STM/STS). Under reflection high-energy-electron diffraction observation, we controlled the periodicity of the STO surface to 2×1 and 2×2 and grew high-quality FeSe films. We found that the substrate periodicity can be imaged through the 1-UC FeSe from high-resolution STM observations and obtained clear evidence that the superconducting gap size depends on the surface periodicity (10–15 meV on 2×1, 12–17 meV on 2×2, and 9–13 meV for 2×1 domains on the 2×2 surface). Our results strongly suggest the important role of the film/substrate interface on high-temperature 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. | 60 | Pressure not reported | onset |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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