Superconductivity of alpha-gallium probed on the atomic scale by normal and Josephson tunneling
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910595922526208 |
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| author | Fohn, C. Wander, D. Nikolic, D. Garaudée, S. Courtois, H. Belzig, W. Chapelier, C. Renard, V. Winkelmann, C. B. |
| author_facet | Fohn, C. Wander, D. Nikolic, D. Garaudée, S. Courtois, H. Belzig, W. Chapelier, C. Renard, V. Winkelmann, C. B. |
| contents | 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 $Δ_{\rm Ga}$ = 163 $μ$eV 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 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_05758 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Superconductivity of alpha-gallium probed on the atomic scale by normal and Josephson tunneling Fohn, C. Wander, D. Nikolic, D. Garaudée, S. Courtois, H. Belzig, W. Chapelier, C. Renard, V. Winkelmann, C. B. Mesoscale and Nanoscale Physics Superconductivity 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 $Δ_{\rm Ga}$ = 163 $μ$eV 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 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. |
| title | Superconductivity of alpha-gallium probed on the atomic scale by normal and Josephson tunneling |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2409.05758 |