Density of states and isotope effect in BiO superconductors: Evidence for nonphonon mechanism

B. Batlogg, R. J. Cava, L. W. Rupp, A. M. Mujsce, J. J. Krajewski, J. P. Remeika, W. F. Peck, A. S. Cooper, G. P. Espinosa

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Abstract

We report measurements of the physical properties of the 30-K superconductor Ba0.6K0.4BiO3, including upper and lower critical fields and normal-state susceptibility. From the results and from comparison with BaPb0.75Bi0.25O3 and band-structure calculations it is concluded that the BiO superconductors are in the weak-coupling limit, implying that the anomalously high Tc's are not due to conventional, strong electron-phonon coupling. A sizable oxygen isotope effect of very similar magnitude is found for both compounds (=0.2-0.25). We speculate that "phononic" effects in these materials are actually only indicative of dressed electronic excitations mediating superconducting pairing.

Original languageEnglish (US)
Pages (from-to)1670-1673
Number of pages4
JournalPhysical review letters
Volume61
Issue number14
DOIs
StatePublished - Jan 1 1988
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Batlogg, B., Cava, R. J., Rupp, L. W., Mujsce, A. M., Krajewski, J. J., Remeika, J. P., Peck, W. F., Cooper, A. S., & Espinosa, G. P. (1988). Density of states and isotope effect in BiO superconductors: Evidence for nonphonon mechanism. Physical review letters, 61(14), 1670-1673. https://doi.org/10.1103/PhysRevLett.61.1670