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Far-Infrared Properties of ab plane oriented YBa2Cu3O7-δ

Published online by Cambridge University Press:  28 February 2011

D. A. Bonn ,
A. H. O'Reilly ,
J. E. Greedan ,
C. V. Stager ,
T. Timusk ,
K. Kamarás  and
D. B. Tanner
D. A. Bonn
Affiliation:
Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1
A. H. O'Reilly
Affiliation:
Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1
J. E. Greedan
Affiliation:
Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1
C. V. Stager
Affiliation:
Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1
T. Timusk
Affiliation:
Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1
K. Kamarás
Affiliation:
Department of Physics University of Florida, Gainesville, Florida 32611
D. B. Tanner
Affiliation:
Department of Physics University of Florida, Gainesville, Florida 32611
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Abstract

Polycrystalline samples of YBa2Cu2O7-δ with a variety of surface treatments show differences in absolute reflectance and width of phonon lines. Samples that are not polished and are measured immediately after annealing have largely grains with the c axis normal to the surface. Such oriented samples show a gap-like depression of conductivity in the far infrared that sets in below the superconducting transition temperature but no true gap. Phonon lines at 195 cm−1 and at 155 cm−1 narrow in the superconducting state, in analogy with the effect of the electron phonon interaction in BCS superconductors. In the normal state the background conductivity is Drude like with a plasma frequency of 0.75 eV and a relaxation rate of 200 cm−1. The extrapolated far-infrared conductivity agrees with the measured dc conductivity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 227
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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