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

Details Multigap superconductivity in sesquicarbides La$_2$C$_3$ and Y$_2$C$_3$ Multigap superconductivity in sesquicarbides La$_2$C$_3$ and Y$_2$C$_3$

2008-01-28

arxiv.org/abs/0801.4176v2

Phys. Rev. Lett. 100, 097002 (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.097002

A complex structure of the superconducting order parameter in $Ln_2$C$_3$ ($Ln$ = La, Y) is demonstrated by muon spin relaxation ($\mu$SR) measurements in their mixed state. The muon depolarization rate [$\sigma_{\rm v}(T)$] 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 $\sigma_{\rm v}(T)$.

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