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Abstract:
Magnetic measurements were performed on single crystalline UPd2Al3
samples. Slightly below H-c2 an anomaly has been observed, which
indicates a sudden change from weak to strong pinning of the flux
vortices. We discuss possible explanations, e.g. the formation of a
spatially modulated superconducting (,,Fulde-Ferrell'') state, and
compare our results with similar ones in CeRu2.