ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Four types of differently prepared NbN films were irradiated at 4.6 K with fast neutrons to a fluence of 5.3 × 1022 m−2 (E(approximately-greater-than)0.1 MeV). The critical current densities Jc were measured in magnetic fields up to 23 T prior to irradiation, following low-temperature irradiation, and again after an annealing cycle to room temperature. In all films, Jc was found to be completely unchanged by the radiation and annealing treatments in fields up to 15 T, but to increase at higher magnetic fields. At the same time, the upper critical fields Bc2 increased by about 0.5 T (∼2%). Replotting Jc versus reduced field B/Bc2 leads to identical field dependencies also in the high-field range. Hence, the observed increase of Jc is equantitatively explained as a Bc2 effect.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.348557
