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

TL;DR

This study uses electronic Raman scattering on Tl-2223 single crystals to investigate the symmetry and magnitude of the superconducting gap, revealing a dx^2-y^2-wave symmetry and strong anisotropy consistent with layered cuprate superconductors.

Contribution

It provides detailed symmetry analysis of the superconducting gap in Tl-2223 using Raman scattering, confirming dx^2-y^2-wave symmetry and layered anisotropic behavior.

Findings

Superconducting gap shows dx^2-y^2-wave symmetry.

Gap ratio 2Delta/kBTc=7.4.

Strong anisotropy due to layered structure.

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.