  We report resistivity measurements of a CrAs single crystal in a wide
temperature range, with the specific aim to assess the applicability of the
Bloch-Gruneisen formula for electron-phonon resistivity. We find that the
resistance reaches a residual value at Tc=4.2 K and its temperature dependence
cannot be fitted only with a suitable Bloch-Gruneisen formula in the whole
temperature range, even though we are able to calculate a well defined
transport Debye temperature. The observed temperature dependent resistivity
seems to suggest a non phonon-mediated superconducting pairing, supporting a
magnetic fluctuation mechanism as the likely glue for the superconducting
coupling.
