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We study the polarization-dependent electronic Raman response of untwinnedYBa$_2$Cu$_3$O$_{7-\delta}$ superconductors employing a tight-binding bandstructure with anisotropic hopping matrix parameters and a superconducting gapwith a mixing of $d$- and s-wave symmetry. Using general arguments we findscreening terms in the $B^{\}_{1g}$ scattering channel which are required bygauge invariance. As a result, we obtain a small but measurable softening ofthe pair-breaking peak, whose position has been attributed for a long time totwice the superconducting gap maximum. Furthermore, we predictsuperconductivity-induced changes in the phonon line shapes that could providea way to detect the isotropic s-wave admixture to the superconducting gap.Comment: typos corrected, 6 pages, 3 figure

physical review b

Screening in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>d</mml:mi><mml:mo>+</mml:mo><mml:mi>s</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math>-wave superconductors: Application to Raman scattering

Screening in(d+s)-wave superconductors: Application to Raman scattering