Anomalous pinning near H<sub>c2</sub> in the heavy fermion superconductor UPd<sub>2</sub>Al<sub>3</sub> studied by magnetic measurements
- Lühmann, T.
- Gegenwart, P.
- Reinders, P.
- Geibel, C.
- Steglich, F.
- Paulsen, C.
- Tholence, J.
DOIAbstract
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
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