  An epitaxial NdFeAs(O,F) thin film of 90 nm thickness grown by molecular beam
epitaxy on MgO single crystal with Tc = 44.2 K has been investigated regarding
a possible vortex glass-liquid tran-sition. The voltage-current characteristics
show excellent scalability according to the vortex-glass model with a static
critical exponent {\nu} of around 1.35 and a temperature-dependent dynamic
exponent z increasing from 7.8 to 9.0 for the investigated temperature range.
The large and non-constant z values are discussed in the frame of 3D vortex
glass, thermally activated flux motion, and inhomogeneity broadening.
