Theoretical study of tunneling spectra in BaxK1-xBiO3

Masafumi Shirai; Naoshi Suzuki; Kazuko Motizuki

doi:10.1016/0038-1098(90)90253-8

Theoretical study of tunneling spectra in Ba_xK_1-xBiO₃

Masafumi Shirai, Naoshi Suzuki, Kazuko Motizuki

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Tunneling spectra of Ba_xK_1-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 language	English
Pages (from-to)	633-635
Number of pages	3
Journal	Solid State Communications
Volume	73
Issue number	9
DOIs	https://doi.org/10.1016/0038-1098(90)90253-8
Publication status	Published - 1990 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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title = "Theoretical study of tunneling spectra in BaxK1-xBiO3",

abstract = "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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T1 - Theoretical study of tunneling spectra in BaxK1-xBiO3

AU - Shirai, Masafumi

AU - Suzuki, Naoshi

AU - Motizuki, Kazuko

PY - 1990/1/1

Y1 - 1990/1/1

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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