Multiple-gap response of type-I noncentrosymmetric BeAu superconductor
Rustem Khasanov, Ritu Gupta, Debarchan Das, Alfred Amon, Andreas Leithe-Jasper, Eteri Svanidze
DOI 10.1103/PhysRevResearch.2.023142 · Physical Review Research
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Abstract
Precise measurements of the thermodynamic critical field (Bc) in the type-I noncentrosymmetric superconductor BeAu were performed by means of the muon-spin rotation and relaxation technique. The temperature evolution of Bc cannot be described within the single-gap scenario and it requires the presence of at least two different types of superconducting order parameters. The self-consistent two-gap approach, adapted for analysis of Bc(T) behavior, suggests the presence of two superconducting energy gaps with the gap-to-Tc ratios 2Δ/kBTc≃4.52 and ≃2.37 for the big gap and the small gap, respectively [Δ=Δ(T=0) is the zero-temperature value of the gap and kB is the Boltzmann constant]. This implies that the superconductivity in BeAu is unconventional and that the supercarrier pairing occurs at various energy bands.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BeAu Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.232 | Pressure unresolved | zero_resistance |
| Be Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.026 | Pressure not reported | unknown |
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