Abstract
By means of electronic Raman scattering we investigated the symmetry of the energy gap 2Δ(→k), its temperature dependence and its variation with doping of well characterized Bi2Sr2CaCu2O8+δ single crystals. The oxygen content δ was varied between the under- and the overdoped regime by subsequently annealing the same single crystal in Ar and in O2, respectively. The symmetry analysis of the polarized electronic Raman scattering is consistent with a dx 2−y2-wave symmetry of the energy gap in both regimes. The gap ratio 2Δmax/kBTc and its temperature dependence changes with doping similar to predictions of theories based on paramagnon coupling.
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We would like to thank D. Einzel, T.P. Devereaux, A. Kampf, M. Krantz, M. Cardona, and K. Maki for stimulating discussions. This work was supported by DFG through SFB 341.
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Hoffmann, A., Lemmens, P., Winkeler, L. et al. The pairing mechanism in HTSC investigated by electronic Raman scattering. J Low Temp Phys 99, 201–203 (1995). https://doi.org/10.1007/BF00752288
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DOI: https://doi.org/10.1007/BF00752288