Evidence of nodal gap structure in the non-centrosymmetric superconductor Y2C3

Abstract

The magnetic penetration depth $\lambda (T)$ and the upper critical field of the non-centrosymmetric (NCS) superconductor Y${}_2$C${}_3$ have been measured using a tunnel-diode (TDO) based resonant oscillation technique. We found that the penetration depth $\lambda (T)$ and its corresponding superfluid density ${\rho }_s(T)$ show linear temperature dependence at very low temperatures ($T\ll T_c$), indicating the existence of line nodes in the superconducting energy gap. Moreover, the upper critical field ${\mu }_0{H}_{c2}(T_c)$ presents an upturn at low temperatures with a rather high value of ${\mu }_0{H}_{c2}(0)$ $\simeq 29$T, which slightly exceeds the weak-coupling Pauli limit. We discuss the possible origins for these nontrivial superconducting properties, and argue that the nodal gap structure in Y${}_2$C${}_3$ is likely attributed to the absence of inversion symmetry, which allows the admixture of spin-singlet and spin-triplet pairing states.

5 pages, 3 figures

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