Abstract
Macroscopic and robust supercurrents are observed by direct electron transport measurements on a silicon surface reconstruction with In adatoms []. The superconducting transition manifests itself as an emergence of the zero resistance state below 2.8 K. characteristics exhibit sharp and hysteretic switching between superconducting and normal states with well-defined critical and retrapping currents. The two-dimensional (2D) critical current density is estimated to be as high as at 1.8 K. The temperature dependence of indicates that the surface atomic steps play the role of strongly coupled Josephson junctions.
- Received 14 June 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.207001
© 2011 American Physical Society
Viewpoint
Supercurrents Get Lean
Published 7 November 2011
Electron transport measurements on thin films reveal whether two-dimensional metals support macroscopic supercurrents.
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