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Proceedings Paper

Raman-scattering characterization of oxygen isotope substituted YBa2Cu3O7-x
Author(s): John C. Irwin; Eric H. Altendorf; J. Chrzanowski; Jurgen P. Franck; Jan Alexander Jung
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Paper Abstract

Th Raman spectrum of YBa2Cu3O7 contains three phonon modes at 502, 435, and 337 cm that arise from the vibrations of oxyn atoms only. These lines are consequently shifted when 0 is substituted for 0 and the measured shifts can 11e compared with theoretical1 predictions and used to determine the degree of 0 substitution. The 502 cm phonon, which involves the moti?i of the 0(4) bridging atoms has been observed to be broadened significantly by 0 substitution. This broadening has been attributed to disorder induced by incomplete substitution at the 0(4) site. To test this hypothesis the equations of motion for a randomly substituted linear chain have been solved numerically and the solutions have been . . . . . 18 used to obtain the linewidth and frequency shift for various degrees of 0 substitution. Good agreement is obtained with the experimental data and the results are discussed in the context of proosed mechanisms6for oxygen exchange. The temperature dependence of the 502 cm mode in both 0 samples and 0-exchanged samples has been carefuly investigated and the measured linewidth has been found to decrease by about 3 cm at T a1nd then increase again at lower temperatures. The possible coupling of the 502 cm mode to charge transfer excitations is discussed.

Paper Details

Date Published: 1 November 1990
PDF: 12 pages
Proc. SPIE 1336, Raman and Luminescence Spectroscopies in Technology II, (1 November 1990); doi: 10.1117/12.22900
Show Author Affiliations
John C. Irwin, Simon Fraser Univ. (Canada)
Eric H. Altendorf, Simon Fraser Univ. (United States)
J. Chrzanowski, Simon Fraser Univ. (Canada)
Jurgen P. Franck, Univ. of Alberta (Canada)
Jan Alexander Jung, Univ. of Alberta (Canada)

Published in SPIE Proceedings Vol. 1336:
Raman and Luminescence Spectroscopies in Technology II
Fran Adar; James E. Griffiths, Editor(s)

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