On type-I noncentrosymmetric superconductor BeAu

May 08, 2020

Our paper on type-I noncentrosymmetric superconductor BeAu is published in Physical Review Research.

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 foranalysis of Bc(T) behavior, suggests the presence of two superconducting energy gaps with the gap-to-Tc ratios 2Δ/kBTc4.52 and 2.37for 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.

Rustem Khasanov, Ritu Gupta, Debarchan Das, Alfred Amon, Andreas Leithe-Jasper, and Eteri Svanidze, "Multiple-gap response of type-I noncentrosymmetric BeAu superconductor," Physical Review Research 2 (2), 1-8 (2020).

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