No abstract

For Superconductor-Superconductor (S-S) point contacts (Nb) a quantitative check is done whether the properties of flux quantum transition into a weakly connected superconducting loop can be predicted from the shape of the corresponding I-U-characteristic. The background is taken from the Resistively Shunted Junction (RSJ)-model using a modified sinusoidal Current-Phase-Relation (CPR). An experimental set-up was built to measure the I-U-characteristic and the flux penetration at the same point contact. The quantitative agreement between the predictions of the RSJ-model and the results of the experiment is surprisingly good

Singularities in the differential resistance of point contacts between Pt and heavy rare-earth metals taken at He-temperatures signal the destruction of magnetic order at a critical bias-current. We argue that the magnetic order is destroyed isothermally by the high drift kinetic energy of cold conduction electrons, and that self-heating of the microscopic contact volume to the magnetic transition temperature is prevented by quantum coherence.

Es wird eine neue, innovative Kryopump‐Technologie vorgestellt, mit der Kryopumpen innerhalb einer Stunde regeneriert werden können. Für den Anlagenbetreiber resultiert daraus im Vergleich mit der konventionellen Kryo‐pump‐Technologie ein deutlicher, geldwerter Vorteil: mehr Produktionszeit.