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An epitaxial NdFeAs(O,F) thin film of 90 nm thickness grown by molecular beamepitaxy on MgO single crystal with Tc = 44.2 K has been investigated regardinga possible vortex glass-liquid tran-sition. The voltage-current characteristicsshow excellent scalability according to the vortex-glass model with a staticcritical exponent {\nu} of around 1.35 and a temperature-dependent dynamicexponent 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 vortexglass, thermally activated flux motion, and inhomogeneity broadening.

Vortex glass-liquid transition and activated flux motion in an epitaxial, super-conducting NdFeAs(O,F) thin film