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Defect Dependence of Positron Lifetimes in Oxide Superconductors

Published online by Cambridge University Press:  26 February 2011

P.A. Sterne ,
J.C. O'Brien ,
R.H. Howell  and
J.H. Kaisert
P.A. Sterne
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
J.C. O'Brien
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
R.H. Howell
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
J.H. Kaisert
Affiliation:
Department of Physics, University of Texas at Arlington, TX 76019
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Abstract

First principles calculations of the positron lifetimes are used to interpret experimental lifetime data for Ba1-xKxBiO3. The observed lifetimes are found to be very sensitive to the presence of defects in the sample. The temperature dependence of the lifetime and the change in lifetime with sample aging are both attributed to defects. The qualitative differences between metal vacancy defects and oxygen vacancy defects in metal oxides are also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 209: Symposium K – Defects in Materials , 1990 , 765
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

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