Superconducting fluctuations in non-superconductors: a reinterpretation of an experiment

Dr. Yaotian Fu (host Seidel), Department of Physics, Washington University in Saint Louis
November 12, 2018 at 4:00 pm
241 Compton
Event Description 

 

Copper is generally considered to be a non-superconductor.  In an experiment
by Levy et al. who observed the magnetic response of 10,000,000 isolated 
copper rings at low temperatures, it was found that the total magnetization
oscillated periodically with a period=half a flux quantum. The authors attributed
their findings to some mesoscopic effect. We suggest that what they were seeing
could be the result of superconducting fluctuations in copper above Tc.