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The in-plane thermal conductivity of iron-based superconductor RbFe$_2$As$_2$single crystal ($T_c \approx$ 2.1 K) was measured down to 100 mK. In zerofield, the observation of a significant residual linear term $\kappa_0/T$ =0.65 mW K$^{-2}$ cm$^{-1}$ provides clear evidence for nodal superdonductinggap. The field dependence of $\kappa_0/T$ is similar to that of its sistercompound CsFe$_2$As$_2$ with comparable residual resistivity $\rho_0$, and liesbetween the dirty and clean KFe$_2$As$_2$. These results suggest that the(K,Rb,Cs)Fe$_2$As$_2$ serial superconductors have a common nodal gap structure.

Heat transport in RbFe2As2 single crystal: evidence for nodal superconducting gap