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The atomic pair distribution functions (PDF) of four powder samples ofYBa2Cu3O6+x (x=0.25, 0.45, 0.65, 0.94) at 15 K have been measured by means ofpulsed neutron diffraction. The PDF is modelled using a full-profile fittingapproach to yield structural parameters. In contrast to earlier XAFS work wefind no evidence of a split apical oxygen site. However, a slightly improvedfit over the average crystallographic model results when the planar Cu(2) siteis split along the z-direction. This is interpreted in terms of chargeinhomogeneities in the CuO2 planes.Comment: 8 pages, 3 figure

physical review. b, condensed matter

Possible charge inhomogeneities in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>planes of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:…

Possible charge inhomogeneities in theCuO2planes ofYBa2