Interfacial effects on the superconducting properties of LaSi2(112) films on Si(111)
Lixia Liu, Guangyao Miao, Bing Liu, Pengfei Nan, Yade Wang, Binghui Ge, Xuetao Zhu, Fang Yang, Weihua Wang, Jiandong Guo
DOI 10.1103/PhysRevB.100.165308 · Physical Review B
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Abstract
Superconducting films are fascinating due to their tunability associated with the interfacial effects. Here we report the superconductivity of single-crystalline LaSi2(112) films epitaxially grown on Si(111) substrates, which exhibit the superconducting transition temperature (Tc) of 3.2 K in films thicker than 21 monolayers (ML) in the strong-coupling regime. At the interface, the LaSi2 films bear the tensile strain, leading to the formation of thickness-dependent stripes. The local superconducting gap varies in real space in accordance with the stripes. In some areas with the thickness of 10–21 ML the superconductivity is enhanced, while in films thinner than 10 ML the superconductivity is suppressed due to the suppression of electronic states at the Fermi level. Our work provides insights into the interfacial effects on the superconductivity of epitaxial compound films from both lattice and electronic aspects.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | Pressure not reported | zero_resistance |
| LaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | zero_resistance |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 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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