Title: Critical fields and fluctuations determined from specific heat and magnetoresistance in the same nanogram SmFeAs(O,F) single crystal,
Abstract: Through a direct comparison of specific heat and magneto-resistance we
critically asses the nature of superconducting fluctuations in the same
nano-gram crystal of SmFeAs(O, F). We show that although the superconducting
fluctuation contribution to conductivity scales well within the 2D-LLL scheme
its predictions contrast the inherently 3D nature of SmFeAs(O, F) in the
vicinity T_{c}. Furthermore the transition seen in specific heat cannot be
satisfactory described either by the LLL or the XY scaling. Additionally we
have validated, through comparing Hc2 values obtained from the entropy
conservation construction (Hab=-19.5 T/K and Hab=-2.9 T/K), the analysis of
fluctuation contribution to conductivity as a reasonable method for estimating
the Hc2 slope.