Evidence of nodal gap structure in the noncentrosymmetric superconductor Y2C3

J. Chen; M. B. Salamon; S. Akutagawa; J. Akimitsu; J. Singleton; J. L. Zhang; L. Jiao; H. Q. Yuan

doi:10.1103/PhysRevB.83.144529

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Evidence of nodal gap structure in the noncentrosymmetric superconductor Y2C3

J. Chen, M. B. Salamon, S. Akutagawa, J. Akimitsu, J. Singleton, J. L. Zhang, L. Jiao, H. Q. Yuan

DOI 10.1103/PhysRevB.83.144529 · Physical Review B

T1

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Abstract

The magnetic penetration depth λ(T) and the upper critical field μ0Hc2(Tc) of the non-centrosymmetric superconductor Y2C3 have been measured using a tunnel-diode-based resonant oscillation technique. We found that the penetration depth λ(T) and its corresponding superfluid density ρs(T) show linear temperature dependence at very low temperatures (T≪Tc), indicating the existence of line nodes in the superconducting energy gap. Moreover, the upper critical field μ0Hc2(Tc) presents a weak upturn at low temperatures with a rather high value of μ0Hc2(0) ≃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 Y2C3 is likely attributed to the absence of inversion symmetry, which allows the admixture of spin-singlet and spin-triplet pairing states.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Y2C3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure not reported	onset
La2C3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18	Pressure not reported	unknown
Mg10Ir19B16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Mo3Al2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown