Superconducting density of states and band structure at the surface of the candidate topological superconductor Au2Pb
Francisco Martín-Vega, Edwin Herrera, Beilun Wu, Víctor Barrena, Federico Mompeán, Mar García-Hernández, Paul C. Canfield, Annica M. Black-Schaffer, José J. Baldoví, Isabel Guillamón, Hermann Suderow
DOI 10.1103/PhysRevResearch.4.023241 · Physical Review Research
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Abstract
The electronic band structure of Au2Pb has a Dirac cone which gaps when undergoing a structural transition into a low temperature superconducting phase. This suggests that the superconducting phase (Tc=1.1 K) might hold topological properties at the surface. Here we make Scanning Tunneling Microscopy experiments on the surface of superconducting Au2Pb. We measure the superconducting gap and find a sizable superconducting density of states at the Fermi level. We discuss possible origins for this finding in terms of superconductivity induced into surface states.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Au2Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | unknown |
| Au2Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | unknown |
| Au2Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | unknown |
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