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Special Seminar Current redistribution effects in superconductors - Ruggero Vaglio
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Europe/Zurich
30/7-018 - Kjell Johnsen Auditorium (CERN)
Description
Current redistribution effects in superconductors
Ruggero Vaglio, CNR-SPIN and University of Napoli “Federico II”
Since early times and nowadays, anomalous peaks (or dips) close to the critical temperature Tc have been occasionally observed in measuring transport properties of superconductors. This can occur pretty often in transport measurements of thin films or tapes, but can also occur in other type of measurements and, in particular, in rf superconducting cavity frequency measurement.
These ”spectacular” peaks have been, by time, interpreted in different ways, often in terms of fancy theoretical models. However, it has been now largely recognized that at least the anomalous peaks in thin films resistance versus temperature measurements are due to “trivial” current redistribution effects related to minor inhomogeneities of the measured samples.
In this lecture we will review this topic and give new evidence that current redistribution effects can also be at the origin of the anomalous peaks (or dips) observed in rf superconducting cavity measurement, in tapes critical current measurements and in other specific cases.