Abstract
We report on the equilibrium vortex phase diagram and vortex dynamics at low temperature T in a thick amorphous (a-)Mg x B 1− x film based on the measurements of the dc resistivity ρ and time ( t)-dependent component of the flux-flow voltage, δ V( t), respectively. Both ρ( T) in perpendicular fields and the vortex phase diagram are qualitatively similar to those for the a-Mo x Si 1− x films, in which evidence for the quantum-vortex-liquid (QVL) phase has been obtained. In either material system we observe anomalous vortex flow with the asymmetric distribution of δ V( t) in the QVL phase, suggesting that the anomalous flow is a universal phenomenon commonly observed for disordered amorphous films, independent of material.
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