Abstract
In this paper, we present the results of measurements of the spin-echo double-resonance signal of 17O-207Pb in superconductive oxides BaPb1 − xBixO3 (x ≤ 0.21). The constants of the spin-spin (17O-207Pb) interactions of nuclear spins, which are proportional to spin susceptibility, have been determined. The direct estimations of the constants of indirect interaction between the nuclei of nearest neighbors (O-Pb and Pb-Pb atoms) give convincing evidence in favor of the development of a microscopically inhomogeneous state of the electron system in the metallic phase of the oxides, for which, according to X-ray diffraction data, there are no signs of macroscopic phase separation.
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