Abstract
We have measured the temperature and magnetic field dependence of resistivity of polycrystallinePrFeAsO0.60F0.12 samples in the normal and superconducting state. The superconducting onset transition temperatureTcon shiftsby ∼4 Kas H is increased from 0 to 14 T. The zero-temperature upper critical fieldHc2(0) estimated by using the Ginzburg–Landau theory and theWerthamer–Helfand–Hohenberg equation exceeds 100 T. The resistivity belowTcon exhibits Arrhenius behavior due to thermally activated flux flow of vortices. The activation energyU0, determined from the Arrhenius plot of the resistivity, shows a power-law decrease () with magnetic field. The normal-state magnetoresistance varies quasilinearly withmagnetic field and does not obey Kohler’s rule, suggesting a multiband feature of thematerial.
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