  Using Raman spectroscopy and transport measurements we investigate thin
epitaxial films of Y{1-x}(Pr,Ca)xBa2Cu3O{6+y}. We explore the electronic Raman
responses obtained after subtraction of phononic excitations, and the 2Delta
peaks that form out of the electronic background below Tc. We find that the
energy of the B1g 2Delta peak increases monotonically with decreasing doping
until the peaks become unresolvable. In contrast, the peaks in A1g symmetry
follow Tc being resolvable in the Pr-doped films. The B2g responses are weak
and a 2Delta peak is only detected at the highest doping level. As a
consequence of strong electron-phonon coupling, the B1g phonon at 340 cm^-1
exhibits a pronounced Fano-type line shape. We use a phenomenological model to
describe the line shape that takes into account real and imaginary part of the
electronic response. It allows us to obtain the self-energy corrections and the
mass- enhancement factor lambda as a measure of the coupling. In the normal
state we find lambda=0.015 around optimal doping and decreasing values with
decreasing doping. The electron-phonon coupling increases strongly below T_c in
overdoped samples in which the B1g 2Delta peaks appear in the vicinity of the
phonon. Self-energy effects observed in the superconducting state can only
partly be assigned to the redistributing electronic response. Anomalies with
respect to frequency, linewidth, and intensity remain. They appear at
increasing tempera- tures with decreasing doping and we provide evidence that
they are connected to the presence of the pseudogap. We supplement our study by
a comparison with single crystal data and investigate the influence of
site-substitutional disorder on the electronic response and the electron-phonon
interaction.
