TY - JOUR
T1 - Theoretical study of tunneling spectra in BaxK1-xBiO3
AU - Shirai, Masafumi
AU - Suzuki, Naoshi
AU - Motizuki, Kazuko
N1 - Funding Information:
Acknowledgements We would like to thank Dr. J.F. Zasadzinski for showing us his experimental data of tunneling measurements before publication. This work is supported by a Grant-in-Aid of Scientific Research on Priority Areas (No. 01631005) from the Ministry of Education, Science and Culture.
PY - 1990/3
Y1 - 1990/3
N2 - 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.
AB - 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.
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U2 - 10.1016/0038-1098(90)90253-8
DO - 10.1016/0038-1098(90)90253-8
M3 - Article
AN - SCOPUS:0025403068
VL - 73
SP - 633
EP - 635
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 9
ER -