Abstract
In single crystalline foils of type II superconducting Nb and Nb alloys, dislocation loops and voids were created during high temperature (400–1000°C) irradiation with Ni ions (3.2–3.5 MeV, up to 8 × 10 16 ions/cm 2 ). Both defect agglomerates exhibit a strong interaction with flux lines, which was determined from measurements of transverse critical currents or volume pinning forces P υ. P υ , as a function of field and temperature, obeys a scaling law (for samples containing voids) and permits the determination of elementary pinning forces, which are compared with theoretical models. The validity of the statistical summation is discussed.
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