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We report a detailed spectroscopic study of the electron doped cupratesuperconductor Pr(2-x)Ce(x)CuO(4-{\delta}) using point contact junctions forx=0.125(underdoped), x=0.15(optimally doped) and x=0.17(overdoped). From ourconductance measurements we are able to identify bosonic resonances for eachdoping. These excitations disappear above the critical temperature, and abovethe critical magnetic field. We find that the energy of the bosonic excitationsdecreases with doping, which excludes lattice vibrations as the paring glue. Weconclude that the bosonic mediator for these cuprates is more likely to be spinexcitations.

Evolution of a bosonic mode across the superconducting dome in the high-Tc cuprate Pr(2-x)Ce(x)CuO(4-{\delta})