By means of electronic Raman scattering we investigated the symmetry of the energy gap Delta(k), its temperature dependence and its variation with doping of well characterized Bi2Sr2CaCu2O8+delta single crystals. The oxygen content delta was varied between the under- and the overdoped regime by subsequently annealing the same single crystal in Ar and O2, respectively. The symmetry analysis of the polarized electronic Raman scattering is consistent with a d_x^2-y^2-wave symmetry of the energy gap in both regimes. The gap ratio 2Delta_max/k_BT_c and its temperature dependence changes with doping similar to predictions of theories based on paramagnon coupling.
@article{arxiv.cond-mat/9410065,
title = {The Pairing Mechanism in HTSC investigated by Electronic Raman Scattering},
author = {A. Hoffmann and P. Lemmens and L. Winkeler and G. Guentherodt},
journal= {arXiv preprint arXiv:cond-mat/9410065},
year = {2009}
}
Comments
3 pages, LaTeX, 2 ps figures available on request to [email protected]