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Phonons, Oxygen Isotope Effect and Superconductivity in Ba1−xKxBiO3

Published online by Cambridge University Press:  26 February 2011

W. Jin ,
C.K. Loong ,
D.G. Hinks ,
P. Vashishta ,
R.K. Kalia ,
M. H. Degani ,
D.L. Price ,
J.D. Jorgensen  and
B. Dabrowski
W. Jin
Affiliation:
Argonne National Laboratory, Argonne, IL, 60439 Science and Technology Center for Superconductivity Materials Science Division
C.K. Loong
Affiliation:
Argonne National Laboratory, Argonne, IL, 60439 Intense Pulsed Neutron Source
D.G. Hinks
Affiliation:
Argonne National Laboratory, Argonne, IL, 60439 Materials Science Division
P. Vashishta
Affiliation:
Argonne National Laboratory, Argonne, IL, 60439 Materials Science Division
R.K. Kalia
Affiliation:
Argonne National Laboratory, Argonne, IL, 60439 Materials Science Division
M. H. Degani
Affiliation:
Argonne National Laboratory, Argonne, IL, 60439 Materials Science Division
D.L. Price
Affiliation:
Argonne National Laboratory, Argonne, IL, 60439 Materials Science Division
J.D. Jorgensen
Affiliation:
Argonne National Laboratory, Argonne, IL, 60439 Materials Science Division
B. Dabrowski
Affiliation:
Argonne National Laboratory, Argonne, IL, 60439 Science and Technology Center for Superconductivity Materials Science Division
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Abstract

The phonon densities-of-states (DOS) of superconducting Ba1−xKxBi16O3 and Ba1−xKxBi18O3 (x=0.4) are determined using molecular dynamics (MD) simulations and inelastic neutron scattering measurements. The reference isotope-effect exponent is obtained from the mass variation of the first frequency moment of the phonon DOS. The energy gap, oxygen isotope-effect exponent and electron tunneling characteristics are calculated within the framework of Eliashberg theory of electron-phonon coupling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 209: Symposium K – Defects in Materials , 1990 , 895
Copyright
Copyright © Materials Research Society 1991

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References

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