Interaction of phonons with intraband electronic excitations and crystal field transitions in Raman spectra of (Nd,Eu,Gd)Ba 2 Cu 3 O y crystals

•First Raman measurements of (Nd,Eu,Gd)Ba2Cu3Oy (NEG-123) superconductors.•We found similarity between NEG-123 and Y-123 Raman spectra.•We could disentangle contributions of phonons, free carriers and f-electrons.•The spectra reflect interaction of phonons with free carriers and f-electrons.