Topological surface states host superconductivity induced by the bulk condensate in YRuB2
Nikhlesh S. Mehta, Bikash Patra, Mona Garg, Ghulam Mohmad, Mohd Monish, Pooja Bhardwaj, P. K. Meena, K. Motla, Ravi P. Singh, Bahadur Singh, Goutam Sheet
DOI 10.1103/PhysRevB.109.L241104 · Physical Review B
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Abstract
While the possibility of topological superconductivity (TSC) in hybrid heterostructures involving topologically nontrivial band structure and superconductors has been proposed, the realization of TSC in a single stoichiometric material is most desired for fundamental experimental investigation of TSC and its device applications. Bulk measurements on YRuB2 detect a single superconducting gap of ∼1 meV. This is supported by our electronic structure calculations, which also reveal the existence of topological surface states in the system. We performed surface-sensitive Andreev reflection spectroscopy on YRuB2 and detected the bulk superconducting gap as well as another superconducting gap of ∼0.5 meV. From our analysis of electronic structure, we show that the smaller gap is formed in the topological surface states in YRuB2 due to the proximity of the bulk superconducting condensate. Thus, in agreement with the past theoretical predictions, we present YRuB2 as a unique system that hosts superconducting topological surface states.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YRuB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.8 | Pressure not reported | onset |
| YRuB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.6 | Pressure not reported | unknown |
| YRuB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.7 | Pressure not reported | unknown |
| PdTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.7 | Pressure not reported | unknown |
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | unknown |
| BiPd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | unknown |
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