Superconductivity of α-gallium probed on the atomic scale by normal and Josephson tunneling
C. Fohn, D. Wander, D. Nikolić, S. Garaudée, H. Courtois, W. Belzig, C. Chapelier, V. Renard, C. B. Winkelmann
DOI 10.1103/PhysRevB.110.174516 · Physical Review B
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Abstract
We investigate superconducting gallium in its α phase using scanning tunneling microscopy and spectroscopy at temperatures down to about 100 mK. High-resolution tunneling spectroscopies using both superconducting and normal tips show that superconducting α-Ga is accurately described by Bardeen-Cooper-Schrieffer theory, with a gap ΔGa=163µeV on the α−Ga(112) facet, with highly homogeneous spectra over the surface, including atomic defects and step edges. Using a superconducting Pb tip, we furthermore study the low-bias conductance features of the Josephson junction formed between the tip and sample. The features are accurately described by dynamical Coulomb blockade theory, highlighting α−Ga as a possible platform for surface science studies of mesoscopic superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ga Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.083 | Pressure not reported | unknown |
| Ga Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.08 | Pressure not reported | onset |
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