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The 17O and 207Pb NMR spectra were measured in ceramic samples in themetallic phase of BaPb_{1-x}Bi_{x}O_3 oxides (0<x< 0.33). The inhomogeneousmagnetic broadening which appears due to a distribution of the Knight shiftswas analyzed in detail. It is shown that Bi atoms, which are randomlyincorporated in BaPbO_3 parent compound give rise to an increased conductionelectron spin density within an area which is delimited by its two first cationshells. According to NMR data the percolative overlap of these areas occurs insuperconducting compositions and it is accompanied by a sharp growth of theaverage Knight shift <Ks>. The decrease of <17Ks> with temperature revealed forx=0.33 evidences for an opening of the energy gap near E_F near themetal-semiconductor transition (x=0.35).Comment: submitted to Phys. Rev.

physical review. b, condensed matter

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>207</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>17</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:math>NMR study of the electron density distribution in the …

207Pband17ONMR study of the electron density distribution in the …