Electronic Raman scattering of Tl-2223 and the symmetry of the supercon- ducting gap

Details Electronic Raman scattering of Tl-2223 and the symmetry of the supercon- ducting gap Electronic Raman scattering of Tl-2223 and the symmetry of the supercon- ducting gap

1994-06-06

arxiv.org/abs/cond-mat/9406027v1

Physics

Condensed Matter

2 pages, Postscript-file including 2 figures. Accepted for publication in the Proceedings of the M^2SHTSC IV Conference, Greno

Scientific paper

10.1016/0921-4534(94)92170-9

Single crystalline Tl2Ba2Ca2Cu3O10 was studied using electronic Raman scattering. The renormalization of the scattering continuum was investigated as a function of the scattering geometry to determine the superconducting energy gap 2Delta(k). The A1g- and B2g-symmetry component show a linear frequency behaviour of the scattering intensity with a peak related to the energy gap, while the B1g-symmetry component shows a characteristic behaviour at higher frequencies. The observed frequency dependencies are consistent with a dx^2-y^2-wave symmetry of the gap and yield a ratio of 2Delta/k_BT_c=7.4. With the polarization of the scattered and incident light either parallel or perpendicular to the CuO2-planes a strong anisotropy due to the layered structure was detected, which indicates an almost 2 dimensional behaviour of this system.

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