期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 63, 期 12, 页码 2345-2348出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0022-3697(02)00239-1
关键词
superconductivity; Raman spectroscopy
We report electronic Raman scattering measurements on Bi2Sr2(Y1-xCax)Cu2O8+delta single crystals at different doping levels. The dependence of the spectra on doping and on incoming photon energy is analyzed for different polarization geometries, in the superconducting and in the normal state. We find the scaling behavior of the superconductivity pair-breaking peak with the carrier concentration to be very different in B-1g and B-2g geometries. Also, we do not find evidence of any significant variation in the lineshape of the spectra in the overdoped region in both symmetries, while we observe a reduction of the intensity in B-2g upon decreasing photon energies. The normal state data are analyzed in terms of the memory-function approach. The quasiparticle relaxation rates in the two symmetries display a dependence on energy and temperature which varies with the doping level. (C) 2002 Elsevier Science Ltd. All rights reserved.
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