Post-growth Fe deposition on the superconductivity of monolayer FeSe films on SrTiO3−δ
Xiaotong Jiao, Guanming Gong, Zhiyu Zhang, Wenfeng Dong, Cui Ding, Minghu Pan, Lili Wang, Qi-Kun Xue
DOI 10.1103/PhysRevMaterials.6.064803 · Physical Review Materials
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Abstract
The superconductivity in bulk FeSe depends sensitively on the stoichiometry, ditto for the monolayer FeSe films grown on SrTiO3−δ and other substrates. To tune the stoichiometry, we deposit Fe onto monolayer FeSe films after epitaxial growth. Using in situ low-temperature scanning tunneling microscopy/spectroscopy, we find that the postdeposited Fe atoms incorporate into monolayer films and combine with excess Se to form FeSe, with an upper coverage limit of ∼0.4 unit-cell. Consequently, the superconducting gap concentrates in 10 to 12 meV. The work demonstrates a simple method for stoichiometry tuning and improving the spatial uniformity of monolayer FeSe films. Compared with the gap of ∼15 to 20 meV for the annealed films, the smaller superconducting gap indicates weakened FeSe-TiO2 coupling due to interfacial Se atom substitution.
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. | 31 | Pressure not reported | onset |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | zero_resistance |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | onset |
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