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

A. Hoffmann·P. Lemmens·G. Guentherodt·V. Thomas·K. Winzer
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Abstract

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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A. Hoffmann, P. Lemmens, G. Guentherodt, V. Thomas, K. Winzer. 1994-06-06. Electronic Raman scattering of Tl-2223 and the symmetry of the supercon- ducting gap. https://doi.org/10.1016/0921-4534(94)92170-9

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