We have heard a fine talk by Arindam Ghosh from the
Indian Institute of Science, Bangalore, in which he presented results from
noise and fluctuations measurements of thin-film NbN superconductors. The
central aspect here, in my view, is that in the long history in the study of
disordered superconductors (and superconductors in general) not much attention
was payed to noise measurements. This is a refreshing approach, which
immediately led to interesting results regarding non-Gaussian distribution in
the interesting region near the BKT transition. Personally I would be very
happy if the technique would be applied near the superconductor-insulator
transition, and perhaps noise measurements could be used as another means to
probe the nature of charge carriers in the insulation state terminating
superconductivity. I am sure this is in the making. I am also aware of other
groups applying noise measurements to superconducting systems and Josephson
junctions with surprising results.
Blogged by Dan Shahar
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