Superconductivity dichotomy in K-coated single and double unit cell FeSe films on SrTiO3
Chenjia Tang, Ding Zhang, Yunyi Zang, Chong Liu, Guanyu Zhou, Zheng Li, Cheng Zheng, Xiaopeng Hu, Canli Song, Shuaihua Ji, Ke He, Xi Chen, Lili Wang, Xucun Ma, Qi-Kun Xue
DOI 10.1103/PhysRevB.92.180507 · 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
We report the superconductivity evolution of one unit cell (1-UC) and 2-UC FeSe films on SrTiO3(001) substrates with potassium (K) adsorption. By in situ scanning tunneling spectroscopy measurement, we find that the superconductivity in 1-UC FeSe films is continuously suppressed with increasing K coverage, whereas nonsuperconducting 2-UC FeSe films become superconducting with a gap of ∼17meV or ∼11meV depending on whether the underlying 1-UC films are superconducting or not. This work explicitly reveals that the FeSe/STO interface plays a vital role in enhancing Cooper pairing in both 1-UC and 2-UC FeSe films.
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. | 56 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure not reported | onset |
| KxFe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Superconductivity dichotomy in K-coated single and double unit cell FeSe films on SrTiO3
similarity 0.99Chenjia Tang et al. · 2015 · arXiv:1509.08950
Source status unknown — claims are unverified
Growth and characterization of high-quality FeSe thin films on SrTiO3 with enhanced superconductivity
similarity 0.96Zhanyi Zhao et al.
Source status unknown — claims are unverified
Role of double TiO2 layers at the interface of FeSe/SrTiO3 superconductors
similarity 0.96Ke Zou et al.
Source status unknown — claims are unverified
Superconductivity of single unit cell FeSe/SrTiO3(001): Substrate-surface superstructure dependence
similarity 0.96Tomoaki Tanaka et al.
Source status unknown — claims are unverified
Tuning stoichiometry and its impact on superconductivity of monolayer and multilayer FeSe on SrTiO3
similarity 0.96Chong Liu & Ke Zou
Source status unknown — claims are unverified
Interface-enhanced high-temperature superconductivity in single-unit-cell FeTe1−xSex films on SrTiO3
similarity 0.96Fangsen Li et al.
Source status unknown — claims are unverified