Observation of topological surface states in the high-temperature superconductor MgB2
Xiaoqing Zhou, Kyle N. Gordon, Kyung-Hwan Jin, Haoxiang Li, Dushyant Narayan, Hengdi Zhao, Hao Zheng, Huaqing Huang, Gang Cao, Nikolai D. Zhigadlo, Feng Liu, Daniel S. Dessau
DOI 10.1103/PhysRevB.100.184511 · Physical Review B
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Abstract
Most topological superconductors known to date suffer from low transition temperatures (Tc) and/or high fragility to disorder and dopant levels, which is hampering the progress in this promising field. Here, utilizing a combination of angle-resolved photoemission spectroscopy measurements and density-functional theory calculations, we show the presence of a type of topological Dirac nodal line surface state on the [010] faces of the Tc=39 K BCS superconductor MgB2. This surface state should be highly tolerant against disorder and inadvertent doping variations and is expected to go superconducting via the proximity effect to the bulk superconductor that this state is intimately connected to. This would represent a form of high-temperature topological superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure unresolved | unknown |
| FeTe1-xSex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.5 | Pressure not reported | unknown |
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