Multigap superconductivity in sesquicarbides La$_2$C$_3$ and Y$_2$C$_3$
| Autor: | Kuroiwa, S., Saura, Y., Akimitsu, J., Hiraishi, M., Miyazaki, M., Satoh, K. H., Takeshita, S., Kadono, R. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 100, 097002 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.100.097002 |
| Popis: | 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 $\sigma_{\rm v}(T)$. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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