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The upper and lower critical fields have been deduced from specific heat andHall probe magnetization measurements in non-optimally doped NdFeAs(O,F) singlecrystals ($T_c \sim 32-35$K). The anisoptropy of the penetration depth($\Gamma_\lambda$) is temperature independent and on the order of $4.0 \pm1.5$. Similarly specific heat data lead an anisotropy of the coherence lenght$\Gamma_\xi \sim 5.5 \pm 1.5$ close to $T_c$. Our results suggest the presenceof rather large thermal fluctuations and to the existence of a vortex liquidphase over a broad temperature range ($\sim 5$K large at 2T).

Upper and lower critical fields in NdFeAs(O,F) single crystals : a study by Hall probe magnetization and specific heat