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Phonons in YBa2Cu3O7−x Type Materials

Published online by Cambridge University Press:  28 February 2011

Gerald Burns ,
F. H. Dacol ,
P. Freitas ,
W. König  and
T. S. Plaskett
Gerald Burns
Affiliation:
IBM T. J. Watson Research Center Yorktown Heights, NY 10598, USA
F. H. Dacol
Affiliation:
IBM T. J. Watson Research Center Yorktown Heights, NY 10598, USA
P. Freitas
Affiliation:
IBM T. J. Watson Research Center Yorktown Heights, NY 10598, USA
W. König
Affiliation:
Max-Planck-lnstitut für Festkörperforschung, Heisenbergstrasse 1, D-7000 Stuttgart 80, Federal Republic of, Germany
T. S. Plaskett
Affiliation:
IBM T. J. Watson Research Center Yorktown Heights, NY 10598, USA
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Abstract

Infrared reflectivity results of YBa2Cu3O7x and SmBa2Cu3O7−x, in the tetragonal semiconducting phase, are reported. At least 10 of the 11 group theoretically allowed modes are observed, and the 11th may be observed in the Sm-material. Due to the fact that the modes are clearly resolved from each other, and, in some cases, have large shifts when Y is replaced by Sm, severial these modes can be assigned to definate vibrations. This and other aspects of the data are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 813
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

1. For a review of the early work in this field, see Khurana, A., Physics Today April 1987, p. 17.Google Scholar
For a review of the early work in this field, see Khurana, A., Physics Today July 1987, p. 17.Google Scholar
2. Burns, G., Dacol, F., Freitas, P., Plaskett, T. and König, W., Solid State Commun. 64, 471 (1987).Google Scholar
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5. (a) Burns, G., Dacol, F., Freitas, P., König, W., and Plaskett, T. S., Phys. Rev. B, submitted.Google Scholar