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

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6 Citations (Scopus)

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.

Original languageEnglish
Article numberR11977
Pages (from-to)R11977-R11980
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number18
DOIs
Publication statusPublished - 1 Nov 2000
Externally publishedYes

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