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We present resistivity and magnetization measurements on proton-irradiatedcrystals demonstrating that the superconducting state in the doped topologicalsuperconductor Nb$_x$Bi$_2$Se$_3$ (x = 0.25) is surprisingly robust againstdisorder-induced electron scattering. The superconducting transitiontemperature $T_c$ decreases without indication of saturation with increasingdefect concentration, and the corresponding scattering rates far surpassexpectations based on conventional theory. The low-temperature variation of theLondon penetration depth $\Delta\lambda(T)$ follows a power law($\Delta\lambda(T)\sim T^2$) indicating the presence of symmetry-protectedpoint nodes. Our results are consistent with the proposed robust nematic $E_u$pairing state in this material.

Robust odd-parity superconductivity in the doped topological insulator Nb$_x$Bi$_2$Se$_3$