Neutron scattering investigation of the spin dynamics in the high temperature superconducting system YBa₂Cu₃O_6+<i>x</i>

Abstract

We report on inelastic neutron scattering experiments carried out on single-crystals of the YBa2Cu3O6+x system. The spin dynamics has been successfully investigated as a function of temperature in the metallic state over the whole doping range from the weakly doped (x = 0.45, 0.51) to the heavily doped (x = 0.69, 0.92) and the overdoped (x = 1) regimes. Dynamical AF-correlations remain in the metallic state but the in-plane correlation length decreases with doping whereas the AF-coupling between the two Cu(2) layers is not affected, except in the overdoped regime.