Theoretical study of tunneling spectra in BaxK1-xBiO3

Masafumi Shirai, Naoshi Suzuki, Kazuko Motizuki

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6 Citations (Scopus)


Tunneling spectra of BaxK1-xBiO3 (BKB) are studied on the basis of the strong coupling theory of phonon mechanism for superconductivity. By using the electron-lattice coupling, which is calculated microscopically by the use of the realistic electronic band structure and the renormalized phonons, we have calculated the spectral function α2F(ω). The gap function Δ(ε{lunate}) is obtained by solving the Eliashberg equation at T=0 K. The superconducting energy gap Δ0 is evaluated to be 4.8 meV for x=0.7 and 1.0 meV for x=0.5. Differential conductance dI dV and its derivative d2I dV2 spectra show apparent deviations from those predicted by the BCS weak coupling theory. The value of Δ0 and the line shapes of dI dV and d2I dV2 are in good agreement with the recent observations.

Original languageEnglish
Pages (from-to)633-635
Number of pages3
JournalSolid State Communications
Issue number9
Publication statusPublished - 1990 Mar


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