Electronic Raman scattering of Tl-2223 and the symmetry of the superconducting gap
Abstract
Single crystalline Tl 2Ba 2Ca 2Cu 3O 10 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 2Δ(k̂). The A 1g- and B 2g-symmetry component show a linear frequency behavior of the scattering intensity with a peak related to the energy gap, while the B 1g-symmetry component shows a characteristic behaviour at higher frequencies. The observed frequency dependencies are consistent with a d x 2-y 2-wave symmetry of the gap and yield a ratio of 2Δ 0/k BT c = 7.4. With the polarization of the scattered and incident light either parallel or perpendicular to the CuO 2-planes a strong anisotropy due to the layered structured was detected, which indicates an almost 2 dimensional behavior of this system.
- Publication:
-
Physica C Superconductivity
- Pub Date:
- December 1994
- DOI:
- 10.1016/0921-4534(94)92170-9
- arXiv:
- arXiv:cond-mat/9406027
- Bibcode:
- 1994PhyC..235.1897H
- Keywords:
-
- Condensed Matter
- E-Print:
- 2 pages, Postscript-file including 2 figures. Accepted for publication in the Proceedings of the M^2SHTSC IV Conference, Grenoble (France), 5-9 July 1994. Proceedings to be published in Physica C. Contact address: ahoff@phys2.rwth-aachen.de