Oxygen isotope effect in superconducting Ba1−xKxBiO3 from phonon density of states
C.-K. Loong, D. G. Hinks, P. Vashishta, W. Jin, R. K. Kalia, M. H. Degani, D. L. Price, J. D. Jorgensen, B. Dabrowski, A. W. Mitchell, D. R. Richards, Y. Zheng
DOI 10.1103/PhysRevLett.66.3217 · Physical Review Letters
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Abstract
The variation of the phonon spectrum of Ba0.6K0.4BiO3 upon oxygen isotope substitution is determined by inelastic neutron scattering (INS). By combining the INS results with molecular-dynamics computer simulation, a value of 0.42±0.05 is obtained for the reference isotope-effect exponent. This is close to the isotope-effect exponent determined from the variation of Tc upon oxygen substitution, indicating that Ba0.6K0.4BiO3 is a weak-coupling superconductor with large matrix elements coupling the electrons to high-energy phonons involving oxygen vibrations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | onset |
| Ba0.6K0.4BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | onset |
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