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Evidence for Phonon-Mediated Coupling in Superconducting Ba0.6K0.4BiO3

Published online by Cambridge University Press:  21 February 2011

D. G. Hinks ,
B. Dabrowski ,
D. R. Richards ,
J. D. Jorgensen ,
Shiyou Pei  and
J. F. Zasadzinski
D. G. Hinks
Affiliation:
Argonne National Laboratory, Materials Science Division, Argonne IL 60439
B. Dabrowski
Affiliation:
Argonne National Laboratory, Materials Science Division, Argonne IL 60439
D. R. Richards
Affiliation:
Argonne National Laboratory, Materials Science Division, Argonne IL 60439
J. D. Jorgensen
Affiliation:
Argonne National Laboratory, Materials Science Division, Argonne IL 60439
Shiyou Pei
Affiliation:
Argonne National Laboratory, Materials Science Division, Argonne IL 60439
J. F. Zasadzinski
Affiliation:
Illinois Institute of Technology, Physics Department, Chicago IL 60616
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Abstract

Superconducting Ba0.6K0.4BiO3, with a Tc of 30K, shows a large 18O isotope effect which indicates that phonons are involved in the pairing mechanism. Infrared reflectivity measurements indicate a value for the superconducting gap consistent with moderate coupling (2Δ/kTc = 3.5 ± 0.5). A mediating energy for pairing of about 40 meV would be required to obtain a Tc of 30K. Strong coupling of electrons by optical phonons (which are present in this material with energies up to 80 meV) could account for the observed transition temperature. Recent tunneling spectroscopy shows the presence of strongly coupled optical phonons in the 40 to 70 meV region, indicating that superconductivity in this material may be phonon mediated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 156: Symposium M – High Temperature Superconductors: Relationships Between Properties, Structure, and Solid State Chemistry , 1989 , 357
Copyright
Copyright © Materials Research Society 1989

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References

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