Observations of the temperature dependence of the peak effect in Nb–N between 4.2° and 1.35°K indicate that the field at which pinning effects set in is independent of temperature in this range. It is suggested that the repulsion between neighboring flux bundles acts to enhance flux pinning in the peak region.
Die Pr/iparation yon reinen sowie zirkon-und titanhaltigen Niobnitridproben durch Diffusion yon Stickstoff unter Druck in Niobdr/ihte ohne und mit Zirkon-bzw. Titanzusatz wird beschrieben. Unter gfinstigen Herstellungsbedingungen sind die (Jberg/inge zur Supraleitung sehr steil (Llbergangsbreite unter 0,1 ~ FOr reines Niobnitrid wird als h6chste fdbergangstemperatur 16,7 ~ beobachtet. Die ~dbergangs-temperatur wird durch Titanzusatz geringffigig erh6ht, durch Zirkonzusatz jedoch erniedrigt.
Niobium nitride samples were irradiated with fast neutrons to a total dosage of 3.7 x 1019 NVT. The current carrying capacity of the samples before and after irradiation was determined. Significant enhancement of the current carrying capacity of the samples was found to result from irradiation (particularly in the 30--80 kGauss range) apparently due to neutron-induced defects acting as pinning centers for the fluxons.
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