Abstract

Inelastic neutron scattering experiments have been carried out on YBa 2Cu 3O 6+ x single crystals to investigate the spin dynamics in the pure AF-state ( x = 0.15, T N = 410 K), in the doped AF-state ( x = 0.37, T N = 180 K), in the metallic weakly doped superconducting state ( x = 0.45, T c = 37 K; x = 0.51, T c = 47 K) and in the T c = 60 K superconducting phase ( x = 0.69, T c = 59 K). The main results are summarized: the two dimensional character of the spin-wave spectrum in the AF-state, strong renormalization of low-energy excitations and overdamping of in-plane spin fluctuations in the doped AF-state, dynamical AF correlations in the superconducting state, evidence for a pseudo-gap induced by superconductivity and existence of superconducting correlations above T c.

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