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We report on the specific heat determination of the anisotropic phase diagramof single crystals of optimally doped SmFeAsO1-xFx. In zero-field, theoptimally doped compound displays a clear cusp-like anomaly in C/T with{\Delta}C/Tc = 24 mJ/molK2 at Tc = 49.5 K. In magnetic fields applied along thec-axis, we find pronounced superconducting fluctuations induced broadening andsuppression of the specific heat anomaly which can be described usingthree-dimensional lowest-Landau-level scaling with an upper critical fieldslope of -3.5 T/K and an anisotropy of {\Gamma} = 8. The small value of{\Delta}C/Tc yields a Sommerfeld coefficient {\gamma} ~ 8 mJ/molK2 indicatingthat SmFeAsO1-xFx is characterized by a modest density of states and strongcoupling.

Anisotropic Phase Diagram and Superconducting Fluctuations in SmFeAsO0.85F0.15