High-energy oxygen phonon modes and superconductivity in Ba1−xKxBiO3: An inelastic-neutron-scattering experiment and molecular-dynamics simulation
C.-K. Loong, P. Vashishta, R. K. Kalia, M. H. Degani, D. L. Price, J. D. Jorgensen, D. G. Hinks, B. Dabrowski, A. W. Mitchell, D. R. Richards, Y. Zheng
DOI 10.1103/PhysRevLett.62.2628 · Physical Review Letters
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Abstract
Phonon densities of states of insulating BaBiO3 and superconducting Ba0.6K0.4BiO3 are determined by neutron-scattering experiments. The main peaks in BaBiO3 occur at 35, 43, 63, and 71 meV. In Ba0.6K0.4BiO3, the phonon spectrum softens and is comprised of two bands around 30 and 60 meV. Molecular-dynamics results, which are in good agreement with the experiment, reveal that the observed phonon peaks are due to oxygen vibrations. The softening of oxygen phonon modes around 30 and 60 meV is due to electron-phonon coupling, indicating that Ba0.6K0.4BiO3 is a normal BCS superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.6K0.4BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26.4 | Pressure not reported | midpoint |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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