An experimental researcher whose work with M. Tinkham measured how thin superconducting films transmit radiation of different frequencies. Extracting their complex electrical conductivity revealed the onset of absorption above an energy threshold. That threshold supplied evidence for a superconducting energy gap, connecting optical response with the spectrum of allowed electronic excitations.[ref]
Conductivity of Superconducting Films for Photon Energies between 0.3 and 40kTc by R. E. Glover III and M. Tinkham. Abstract: lead and tin film transmission, complex conductivity and excitation gap
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