Multiple-gap response of type-I noncentrosymmetric BeAu superconductor

Abstract

Precise measurements of the thermodynamic critical field ($B_{\mathrm{c}}$) in type-I noncentrosymmetric superconductor BeAu were performed by means of the muon-spin rotation/relaxation technique. The temperature evolution of $B_{\mathrm{c}}$ can not be described within the single gap scenario and it requires the presence of at least two different types of the superconducting order parameters. The self-consistent two-gap approach, adapted for analysis of $B_{\mathrm{c}}(T)$ behavior, suggests the presence of two superconducing energy gaps with the gap to $T_{\mathrm{c}}$ ratios $2\Delta /k_{\mathrm{B}}{T}_{\mathrm{c}}\simeq 4.52$ and $\simeq 2.37$ for the big and the small gap, respectively. This implies that the superconductivity in BeAu is unconventional and that the supercarrier pairing occurs at various energy bands.

arXiv comment6 pages, 2 figures

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