Interface-enhanced high-temperature superconductivity in single-unit-cell FeTe1−xSex films on SrTiO3
Fangsen Li, Hao Ding, Chenjia Tang, Junping Peng, Qinghua Zhang, Wenhao Zhang, Guanyu Zhou, Ding Zhang, Can-Li Song, Ke He, Shuaihua Ji, Xi Chen, Lin Gu, Lili Wang, Xu-Cun Ma, Qi-Kun Xue
DOI 10.1103/PhysRevB.91.220503 · Physical Review B
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Abstract
Recently discovered high-temperature superconductivity in single-unit-cell (UC) FeSe films on SrTiO3 (STO) substrate has stimulated tremendous research interest, both experimental and theoretical. Whether this scenario could be extended to other superconductors is vital in both identifying the enhanced superconductivity mechanism and further raising the critical transition temperature (Tc). Here we successfully prepared single-UC FeTe1−xSex(0.1≤x≤0.6) films on STO substrates by molecular beam epitaxy and observed U-shaped superconducting gaps (Δ) up to ∼16.5meV, nearly ten times the gap value (Δ∼1.7meV) of the optimally doped bulk FeTe0.6Se0.4 single crystal (Tc∼14.5K). No superconducting gap has been observed on the second UC and thicker FeTe1−xSex films at 5.7 K, indicating the important role of the interface. This interface-enhanced high-temperature superconductivity is further confirmed by ex situ transport measurements, which revealed an onset superconducting transition temperature above 40 K, nearly two times higher than that of the optimally doped bulk FeTe0.6Se0.4 single crystal. This work demonstrates that interface engineering is a feasible way to discover alternative superconductors with higher Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeTe1-xSex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
| FeTe0.5Se0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
| FeTe0.6Se0.4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.5 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | unknown |
| FeTe0.5Se0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
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