Atomic thin layers of Sn exhibit superconductivity
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l effect, and we set [about] to look for this effect by the low-temperature magneto-transport technique,” Zhang says. “Instead, we found superconductivity.” The material investigated, which led to the discovery, possesses a “sandwich” structure consisting of a stanene top layer, a PbTe structure buffer layer, a Bi2Te3 topological insulator layer, and a singlecrystalline silicon bottom substrate. Experimental results showed that the temperature at which superconductivity emerges is strongly correlated to the number of layers of tin. The superconductivity did not occur for the singlelayer sample but appeared in the bilayer sample. Further, the transition temperature scaled with the inverse of the number of layers. In addition, the researchers observed that the thickness of the underlying buffer layer, PbTe, could also change the transition temperature. This observation was ascribed to the proximity effect of stanene and PbTe, which resulted in electron doping from PbTe and release of lattice strain of stanene. The evolution of the stanene’s electronic
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• VOLUME 43 • MAY 2018IP • address: www.mrs.org/bulletin Downloaded MRS fromBULLETIN https://www.cambridge.org/core. 80.82.77.83, on 13 May 2018 at 21:43:53, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/mrs.2018.101
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