Abstract
The E//c far-infrared reflection spectra of a YBa2Cu3O7 single crystal were fitted for three different temperatures (10 K, 60 K and 100 K) using phononic oscillators, a mid-infrared excitation and a low-energy plasmon. The plasmon frequency changes from 600 cm-1 in the normal state to 365 cm-1 in the superconducting state. Some consequences of strong plasmon-phonon interaction for the pairing mechanism are discussed.
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