Study of the energy gap in superconductors of the Y-Ba-Cu-O system by the IR reflection method
Abel' E. V., Bagaev V. S., Basov D. N. , El'tsev Yu. F., Ivanenko O. M., Mitsen K. V., Omel'yanovskii O. E., Pechen' E. V., Plotnikov A. F., Poyarkov A. G.
A procedure is proposed for analyzing the reflection spectra of superconductors to determine the width of the energy gap and to plot its temperature dependence. The value 2L/kTc determined experimentally has been found to be ~ 3.5.