Remarkable effects of disorder on superconductivity of single atomic layers of lead on silicon
By Christophe Brun, T. Cren, V. Cherkez, F. Debontridder, Stéphane Pons, D. Fokin, M. Tringides, S. Bozhko, L. Ioffe, Boris L. Altshuler and 1 more. Nature Physics, 2014
149 citations recorded by the source corpus.
In bulk materials, superconductivity is remarkably robust with respect to non-magnetic disorder. In the two-dimensional limit, however, disorder and electron correlations both tend to destroy the quantum condensate. Here we study, both experimentally and theoretically, the effect of structural disorder on the local spectral response of crystalline superconducting monolayers of lead on silicon. In a direct scanning tunnelling microscopy measurement, we reveal how the local superconducting spectra lose their conventional character and show variations at scales significantly shorter than the coherence length. We demonstrate that the precise atomic organization determines the robustness of the superconducting order with respect to structural defects, such as single atomic steps, which may disrupt superconductivity and act as native Josephson barriers. We expect that our results will improve the understanding of microscopic processes in surface and interface superconductivity, and will open a new way of engineering atomic-scale superconducting quantum devices. The effect of structural disorder on superconductivity can be subtle: for two crystalline arrangements of superconducting lead monolayers deposited on silicon, there are unexpected spatial variations that result in macroscopically different behaviour.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/f3974a8e4a9c2b1dd994d01169a16bab7f7ec209
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Citations in the corpus
- Coherent long-range magnetic bound states in a superconductor (2015, background): “As this effect is related to the dimensionality it should manifest in a wide variety of superconductors, such as lamellar materials or recently discovered superconducting monolayers of Pb/Si(111), In/Si(111) [23, 24] and FeSe/SrTiO3[25].”