Abstract
In ceramic superconductor BaPb 0.75 Bi 0.25 O 3 with current-voltage characteristics of the tunnel-type the spectrum of voltage fluctuations was measured for T = 4.2 K. The noise spectral density S V (f) in the frequency range 20 Hz ≤ f ≤ 500 Hz is described by the formula f -α (1 ≤ a ≤ 2.2), where α is substantially dependent on the external magnetic field H ≤ 16.6 Oe. The observed noise is apparently associated with the emergence of the superconducting glass state. The spectra contain also voltage oscillations of thermal origin with the fundamental frequency f o ≈ 100 Hz.
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