Indirect ²⁰⁷Pb−²⁰⁷Pb and ¹⁷O−²⁰⁷Pb nuclear spin-spin interactions in the metallic phase of BaPb_1−xBi_xO₃

A Pb-207 spin echo signal and a O-17-Pb-207 spin echo double resonance signal were measured in the metallic phase of BaPb1 - xBixO3 oxides (x < 0.15). Constants of indirect homonuclear (Pb-207-Pb-207) and heteronuclear (O-17-Pb-207) 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. (C) 2004 MAIK "Nauka / Interperiodica".