Nodeless superconductivity in Ca3Ir4Sn13: evidence from quasiparticle heat transport

S. Y. Zhou, H. Zhang, X. C. Hong +5

We report resistivity $\rho$ and thermal conductivity $\kappa$ measurements on Ca${}_3$Ir${}_4$Sn${}_{13}$ single crystals, in which superconductivity with $T_c\approx 7$ K was claimed to coexi…