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We present heat capacity measurements of the upper critical fields ofsingle-crystal NdFeAsO1-xFx. In zero-magnetic field a clear step in the heatcapacity is observed at Tc = 47K . In fields applied perpendicular to theFeAs-layers the step broadens significantly whereas for the in-planeorientation the field effects are small. This behavior is reminiscent of theCuO2-high-Tc superconductors and is a manifestation of pronounced fluctuationeffects. Using an entropy conserving construction we determine the transitiontemperatures in applied fields and the upper critical field slopes of dHc2,a =-0.72 T/K and dHc2,ab = -3.1 T/K. Zero-temperature coherence lengths of xiab =3.7 nm and xic = 0.9 nm and a modest superconducting anisotropy of gamma ~ 4can be deduced in a single-band model.

Caloric Determination of the Upper Critical Fields and Anisotropy of NdFeAsO1-xFx Single Crystals