Indirect 207Pb−207Pb and 17O−207Pb nuclear spin-spin interactions in the metallic phase of BaPb1−xBixO3

A ²⁰⁷Pb spin echo signal and a ¹⁷O−²⁰⁷Pb spin echo double resonance signal were measured in the metallic phase of BaPb_1−x Bi_xO₃ oxides (x<0.15). Constants of indirect homonuclear (²⁰⁷Pb-²⁰⁷Pb) and heteronuclear (¹⁷O-²⁰⁷Pb) couplings of nuclear spins through the conduction electron system were determined. Evidence was obtained for the development of a microscopically nonuniform spin-density distribution in Bi-containing oxides.