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Raman Scattering Studies on Superconducting YBa2Cu3O7−x, Semiconducting YBa2Cu3O6+x, and Possible Impurity Phases

Published online by Cambridge University Press:  28 February 2011

A. Mascarenhas ,
H. Katayama-Yoshlda ,
S. Geller ,
J. I. Pánkové  and
S. K. Debt
A. Mascarenhas
Affiliation:
Solar Energy Research Institute, Golden, CO 80401
H. Katayama-Yoshlda
Affiliation:
Solar Energy Research Institute, Golden, CO 80401 Physics Department, Tohoku University, Kendai 980, Japan
S. Geller
Affiliation:
Department of Electrical and Computer Engineering, University of Colorado, Boulder, CO 80309.
J. I. Pánkové
Affiliation:
Department of Electrical and Computer Engineering, University of Colorado, Boulder, CO 80309.
S. K. Debt
Affiliation:
Solar Energy Research Institute, Golden, CO 80401
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Abstract

A Raman spectroscopie investigation of specimens of superconducting YBa2Cu3O7−x and semiconducting YBa2Cu3O6+x indicates that in the range 100 to 700 cm-1, the characteristic lines of the superconductor at 13 K, are at 150, 338, 441, 507, 590, and 644 cm-1. Comparison of the Ranan spectra of the superconductor and the semiconductor indicates a mode stiffening of the pair at 338 and 441 cm-1, hut a mode softening of the pair at 507 and 590 cm-1. A factor group analysis leads to a tentative assignment of the Raman and infrared allowed modes. At temperatures 12K < T < 180K the Raman spectra of the superconductor indicate that the phonon mode at 338 cm-1 has an anomalous temperature dependence below the superconducting critical temperature (Tc).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 415
Copyright
Copyright © Materials Research Society 1988

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References

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