2011/02/03 by J. Chen, M. B. Salamon, S. Akutagawa +9 · 2 citations
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Coupling (piping) #Critical field #Crystallography #Energy (signal processing) #Iron-based superconductors research #Lambda #London penetration depth #Materials science #Pairing #Penetration depth #Physics #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity #Superconductivity in MgB2 and Alloys #Superfluidity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.83.144529
published as Phys. Rev. B 83, 144529 (2011) · 5 pages, 3 figures
arxiv created 2011/02/03 · openalex publication_date 2011/04/29 · arxiv updated 2015/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The magnetic penetration depth \ensuremathλ(T) and the upper critical field \ensuremathμ0Hc2(Tc) of the non-centrosymmetric superconductor Y2C3 have been measured using a tunnel-diode-based resonant oscillation technique. We found that the penetration depth \ensuremathλ(T) and its corresponding superfluid density \ensuremathρs(T) show linear temperature dependence at very low temperatures (T\ensuremath≪Tc), indicating the existence of line nodes in the superconducting energy gap. Moreover, the upper critical field \ensuremathμ0Hc2(Tc) presents a weak upturn at low temperatures with a rather high value of \ensuremathμ0Hc2(0) \ensuremath≃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.