Subkelvin tunneling spectroscopy showing Bardeen-Cooper-Schrieffer superconductivity in heavily boron-doped silicon epilayers
F. Dahlem, T. Kociniewski, C. Marcenat, A. Grockowiak, L. M. A. Pascal, P. Achatz, J. Boulmer, D. Débarre, T. Klein, E. Bustarret, H. Courtois
DOI 10.1103/PhysRevB.82.140505 · Physical Review B
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Abstract
Scanning tunneling spectroscopies in the subkelvin temperature range were performed on superconducting silicon epilayers doped with boron in the atomic percent range. The resulting local differential conductance behaved as expected for a homogeneous superconductor, with an energy-gap dispersion below ±10%. The spectral shape, the amplitude, and temperature dependence of the superconductivity gap follow the BCS model, bringing support to the hypothesis of a hole pairing mechanism mediated by phonons in the weak-coupling limit.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.35 | Pressure unresolved | zero_resistance |
| Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.51 | Pressure unresolved | zero_resistance |
| Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.59 | Pressure unresolved | zero_resistance |
| Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.48 | Pressure unresolved | midpoint |
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