Systematic Raman study of optical phonons in RBa2Cu3 O6+δ (R= Y, Dy, Gd, Sm, Nd): Antiferromagnetic coupling strength versus lattice parameters

We present a systematic study of the interplay between lattice parameters and the energy of the optical phonons as well as the antiferromagnetic coupling strength, J, in the high-Tc superconducting cuprate RBa2Cu3O6+δ (R-123, R=Y, Dy, Gd, Sm, Nd) with hole doping p (0.0