Observation of high-Tc superconductivity in rectangular FeSe/SrTiO3(110) monolayers
P. Zhang, X.-L. Peng, T. Qian, P. Richard, X. Shi, J.-Z. Ma, B. B. Fu, Y.-L. Guo, Z. Q. Han, S. C. Wang, L. L. Wang, Q.-K. Xue, J. P. Hu, Y.-J. Sun, H. Ding
DOI 10.1103/PhysRevB.94.104510 · Physical Review B
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Abstract
We design a monolayer film of FeSe on SrTiO3(110) substrate [FeSe/STO(110)], with a C2 symmetry induced by epitaxial strain. Compared to FeSe on SrTiO3(001) substrate [FeSe/STO(001)], one of the in-plane lattice constants is reduced by 6%, to ∼3.67 Å. FeSe/STO(110) exhibits a large nearly isotropic superconducting gap of 16 meV filled around 60 K, similar to those obtained on FeSe/STO(001) films. Our results strongly suggest that the lattice C4 symmetry is not essential for reaching high Tc's in Fe-based superconductors and pose a new challenge to theory.
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. | 50 | 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 unresolved | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | unknown |
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