Electronic Raman scattering of superconducting YBa2Cu3Oy single crystals |
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Authors: | X K Chen R Liang W N Hardy and J C Irwin |
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Affiliation: | (1) Physics Department, Simon Fraser University, V5A 1S6 Burnaby, British Columbia, Canada;(2) Physics Department, University of British Columbia, V6T 1Z1 Vancouver, British Columbia, Canada |
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Abstract: | TheA
1g
andB
1g
low-energy Raman continua of YBa2Cu3O
y
(Y123) single crystals, withy=7.0, 6.99, and 6.93, have been investigated. It is found that the peak frequency of theA
1g
continuum is equal to 310±10 cm–1 and independent of oxygen concentration fory in the above range. The central frequency of the broad peak in theB
1g
continuum, however, shifts from about 470 cm–1 fory7.0 to 550 cm–1 fory6.93. Thus, a relatively small change in oxygen concentration results in a significant redistribution of the states contributing to theB
1g
continuum. Assuming the low-energy portions of the continua are electronic in origin, the Raman spectra have been calculated and the results compared to the experimental spectra. It is suggested that the Raman continua arise, at least in part, from scattering across a spin fluctuation-induced pseudogap. |
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Keywords: | Raman continuum high-T
c
Y123 |
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