Superconducting dome revealed by surface structure dependence in single unit cell FeSe on SrTiO3(001)
Tomoaki Tanaka, Kenta Akiyama, Satoru Ichinokura, Ryota Shimizu, Taro Hitosugi, Toru Hirahara
DOI 10.1103/PhysRevB.101.205421 · Physical Review B
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Abstract
We report the superconducting properties of single unit cell FeSe prepared on SrTiO3(STO)(001)−c(6×2) using scanning tunneling microscopy/spectroscopy (STM/STS). A surface superstructure of c(6×2) was obtained by annealing the substrate under an oxygen atmosphere. A 3×1 periodicity, which corresponds to the topmost Ti atoms of the substrate, was observed in high-resolution STM images, and the superconducting gap size was 11.5±2.5meV. A nonsuperconducting region with additional 2×2 periodicity was also found, and this originates from the difference in the arrangement of the Sr and Ti atoms at the surface. We conclude that there is a universal superconducting dome structure in the (electron-doping level)—(superconducting gap size) phase diagram by comparing with previous results that controlled the surface of the substrate/film and the gap size can be maximized/minimized by selecting the appropriate STO surface superstructure.
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. | 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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