Large oxygen-isotope effect in Sr0.4K0.6BiO3: Evidence for phonon-mediated superconductivity
Guo-meng Zhao, K. Conder, M. Angst, S. M. Kazakov, J. Karpinski, M. Maciejewski, C. Bougerol, J. S. Pshirkov, E. V. Antipov
DOI 10.1103/PhysRevB.62.R11977 · Physical Review B
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Abstract
The oxygen-isotope effect has been investigated in a recently discovered superconductor Sr0.4K0.6BiO3. This compound has a distorted perovskite structure and becomes superconducting at about 12 K. Upon replacing 16O with 18O by 60–80%, the Tc of the sample is shifted down by 0.32–0.50 K, corresponding to an isotope exponent of αO=0.40(5). This isotope exponent is very close to that for a similar bismuthate superconductor Ba1−xKxBiO3 with Tc=30 K. The very distinctive doping and Tc dependencies of αO observed in bismuthates and cuprates suggest that bismuthates should belong to conventional phonon-mediated superconductors while cuprates might be unconventional superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr0.4K0.6BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | onset |
| Sr1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | onset |
| 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 |
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