Multigap superconductivity in sesquicarbides La${}_2$C${}_3$ and Y${}_2$C${}_3$

Abstract

A complex structure of the superconducting order parameter in $L{n}_2$C${}_3$ ($Ln$ = La, Y) is demonstrated by muon spin relaxation ($\mu$SR) measurements in their mixed state. The muon depolarization rate [${\sigma }_{\mathrm{v}}(T)$] exhibits a characteristic temperature dependence that can be perfectly described by a phenomenological double-gap model for nodeless superconductivity. While the magnitude of two gaps is similar between La${}_2$C${}_3$ and Y${}_2$C${}_3$, a significant difference in the interband coupling between those two cases is clearly observed in the behavior of ${\sigma }_{\mathrm{v}}(T)$.

arXiv comment5 pages, 4 figures

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