Magnetoresistance Measurements of a Superconducting Surface State of In-Induced and Pb-Induced Structures on Si(111)
- 4 June 2013
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 110 (23), 237001
- https://doi.org/10.1103/physrevlett.110.237001
Abstract
In situ micro-four-point-probe conductivity measurements in ultrahigh vacuum revealed that the Si(111)-striped incommensurate-Pb surface showed the superconductivity transition at 1.1 K. Both of the hexagonal and rectangular phases of -In surface showed superconductivity at 2.4 and 2.8 K, respectively. By applying magnetic field perpendicular to the surface, the upper critical field was deduced to be 0.1–1 T. The derived Ginzburg-Landau coherence length of the Cooper pairs was several tens of nm, which was much smaller than the Pippard’s coherence length estimated from the band structures. The short coherence length is determined by the carrier mean free path.
Keywords
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