Abstract
Quasiparticle-tunneling measurements on sandwich junctions patterned from molecular-beam-epitaxy-grown ${\mathrm{Ba}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{K}}_{\mathit{x}}$${\mathrm{BiO}}_{3}$/${\mathrm{BaBi}}_{2}$${\mathrm{O}}_{\mathit{y}}$/${\mathrm{Ba}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{K}}_{\mathit{x}}$${\mathrm{BiO}}_{3}$ trilayers are presented, where we find evidence for superconductor--insulator--normal-metal tunneling with a 2-meV gap. The subgap conductance is found to vary from a linear voltage dependence to a BCS-like voltage dependence. The temperature dependence of the zero-bias conductance and the thermal broadening of the conductance peak are studied.
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