paper

Evidence of s-wave pairing symmetry in layered superconductor Li $_{0.68}$ NbO $_{2}$ from the specific heat measurement

arXiv:cond-mat/0602476 · doi:10.1103/PhysRevB.74.012504

Abstract

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 specific heat were measured down to 0.5 K. The upper critical field $H_{c 2} (T)$ is deduced from the resistivity data and $H_{c 2} (0)$ is estimated to be $\sim 2.98$ T. A notable specific heat jump is observed at the superconducting transition temperature $T_{c} \sim 5.0$ K at zero field. Below $T_{c}$ , the electronic specific heat shows a thermal activated behavior and agrees well with the theoretical result of the BCS s-wave superconductors. It indicates that the superconducting pairing in Li $_{0.68}$ NbO $_{2}$ has s-wave symmetry.

4 pages, 5 figures

Evidence of s-wave pairing symmetry in layered superconductor Li0.68​NbO2​ from the specific heat measurement

Abstract

Evidence of s-wave pairing symmetry in layered superconductor Li $_{0.68}$ NbO $_{2}$ from the specific heat measurement