Negative-light-flux spectroscopy of oriented films
Boldyrev N. Yu., Burlakov V. M., Golovashkin A. I., Zhizhin G. N., Mit'ko A. G. , Krasnosvobodtsev S. I. , Pechen' E. V., Khadzhiiskii Yu. A.
The absorption spectra of oriented YBa2Cu307 films in the regime of negative light fluxes are reported. The spectra are interpreted on the basis of a model calculation in which it is assumed that there is no gap in the IR conductivity spectrum of (ω) of the superconductor.