Evidence of s-wave pairing symmetry in layered superconductor Li${}_{0.68}$NbO${}_2$ from the specific heat measurement

G. T. liu, J. L. Luo, Z. Li +4

A high quality superconducting Li${}_{0.68}$NbO${}_2$ polycrystalline sample was synthesized by deintercalation of Li ions from Li${}_{0.93}$NbO${}_2$. The field dependent resistivity and…