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We report the resistivity of a series of fluorine-doped SmFeAsO1-xFxpolycrystalline superconductors in magnetic fields up to 60T. For underdopedsamples (x < 0.15), the low temperature resistive state is characterized bypronounced magneto-resistance and a resistive upturn at low temperatures. The"insulating behavior" is characterized by a log-T divergence observed over adecade in temperature. In contrast, the normal state for samples with doping x> 0.15 display metallic behavior with little magnetoresistance, where intensemagnetic fields broaden the superconducting transition rather than suppress Tc.The location of the insulator-to metal crossover coincides with the reportedsuppression of the structural phase transition (SPT)in the phase diagram forSmFeAsO1-xFx series.

Log-T divergence and Insulator-to-Metal Crossover in the normal state resistivity of fluorine doped SmFeAsO1-xFx