Current distribution effects in superconductors

by Prof. Ruggero Vaglio (INFN Napoli)

Wednesday 17 Jul 2013, 15:00 → 16:00 Europe/Rome

M. Baldo Ceolin meeting room (INFN-LNL)

Non conventional behavior of transport properties (resistivity , thermal conductivity,  surface impedance, critical currents) are often observed in superconductor measurements, with the appearance of anomalous peaks at the transition. Similar effects are also observed in magnetic compounds exhibiting 
sharp resistive transitions at the Curie temperature and in other systems. Though these effects have been often interpreted in different, complicated ways, in many  cases it was recognized  and proved that  this is due to simple current redistribution effects related to the slightly non-homogeneous nature of the measured samples.
In this lecture we will briefly review and discuss these effects and, referring to very simple concentrated constant equivalent circuits, we will show how sample non-homogeneity can easily reproduce all the observed features.