Nodeless superconducting gap in electron-doped BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$ probed by quasiparticle heat transport

L. Ding, J. K. Dong, S. Y. Zhou +8

The in-plane thermal conductivity $\kappa$ of electron-doped iron-arsenide superconductor BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$ ($T_c$ = 20.3 K) single crystal was measured down to 70 mK. In zer…