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- W2152518924 abstract "We study the polarization-dependent electronic Raman response of untwined $mathrm{Y}{mathrm{Ba}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}ensuremath{delta}}$ superconductors employing a tight-binding band structure with anisotropic hopping matrix parameters and a superconducting gap with a mixing of $d$- and $s$-wave symmetries. Using general arguments we find screening terms in the ${B}_{1g}$ scattering channel which are required by gauge invariance. As a result, we obtain a small but measurable softening of the pair-breaking peak, whose position has been attributed for a long time to twice the superconducting gap maximum. Furthermore, we predict superconductivity-induced changes in the phonon line shapes that could provide a way to detect the isotropic $s$-wave admixture to the superconducting gap." @default.
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- W2152518924 date "2007-05-31" @default.
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- W2152518924 title "Screening in(d+s)-wave superconductors: Application to Raman scattering" @default.
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- W2152518924 doi "https://doi.org/10.1103/physrevb.75.174525" @default.
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