Physics – Condensed Matter – Superconductivity
Scientific paper
1998-07-23
Physics
Condensed Matter
Superconductivity
5 pages REVTex, 5 figures, 32 refs, accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.58.9479
We have analysed optical reflectivity data for Ba_{1-x}K_xBiO_3 in the far-infrared region using Migdal-Eliashberg theory and found it inconsistent with standard electron-phonon coupling: Whereas the superconducting state data could be explained using moderate coupling, \lambda=0.7, the normal state properties indicate \lambda \le 0.2. We have found that such behaviour could be understood using a simple model consisting of weak standard electron-phonon coupling plus weak coupling to an unspecified high energy excitation near 0.4 eV. This model is found to be in general agreement with the reflectivity data, except for the predicted superconducting gap size. The additional high energy excitation suggests that the dominant coupling mechanism in Ba_{1-x}K_xBiO_3 is not standard electron-phonon.
Dolgov Oleg V.
Kaufmann H. J.
Salje E. K. H.
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