Abstract
An ultraviolet photoemission study on single-crystal ${\mathrm{BaPb}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Bi}}_{\mathrm{x}}$${\mathrm{O}}_{3}$ with x=0.15 (superconductor) and x=1.0 (semiconductor) has been presented. A clear Fermi-edge structure was observed for the first time for the superconducting compound. A rigid shift of the valence band by 0.3--0.4 eV between the superconductor and the semiconductor was observed although the shift is much smaller than predicted from the band-structure calculation. The ``mysterious 9-eV peak,'' whose origin has been controversial in cuprate superconductors, was found also for degraded crystal surfaces of ${\mathrm{BaPb}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Bi}}_{\mathrm{x}}$${\mathrm{O}}_{3}$. Its origin was discussed in connection with the difference and similarity in the high-${T}_{c}$ mechanism between cuprate and noncuprate superconductors.
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