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Magnetization and 63Cu NMR-NQR relaxation measurements are used to study thesuperconducting fluctuations in YBa2Cu3O6+x (YBCO) oriented powders. Inoptimally doped YBCO the fluctuating negative magnetization M_{fl}(H,T) israther well described by an anisotropic Ginzburg-Landau (GL) functional and thecurves M_{fl}/sqrt{H} cross at Tc. In underdoped YBCO, instead, over a widetemperature range an anomalous diamagnetism is observed, stronger than in theoptimally doped compound by about an order of magnitude. The field andtemperature dependences of M_{fl} cannot be described either by an anisotropicGL functional or on the basis of scaling arguments. The anomalous diamagnetismis more pronounced in samples with a defined order in the Cu(1)O chains. The63Cu(2) relaxation rate shows little, if any, field dependence in the vicinityof the transition temperature Tc(H=0). It is argued how the results in theunderdoped compounds can be accounted for by the presence of chargeinhomogeneities, favoured by chains ordering

physical review. b, condensed matter

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Superconducting fluctuations and anomalous diamagnetism in underdopedYBa2Cu3O