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• W2281682913 abstract "${mathrm{Bi}}_{2}{mathrm{Sr}}_{2}{mathrm{CaCu}}_{2}{mathrm{O}}_{8+ensuremath{delta}}$ crystals with varying hole concentrations $(0.12<p<0.23)$ were studied to investigate the effects of doping on the symmetry and magnitude of the superconducting gap $[ensuremath{Delta}(mathbf{k})].$ Electronic Raman scattering experiments that sample regions of the Fermi surface near the diagonal ${(B}_{2g})$ and principal axes ${(B}_{1g})$ of the Brillouin zone have been utilized. The frequency dependence of the Raman response function ${ensuremath{chi}}^{ensuremath{''}}$ at low energies $[ensuremath{omega}<ensuremath{Delta}(mathbf{k})]$ is found to be linear for ${B}_{2g}$ and cubic for ${B}_{1g}$ $(T<{T}_{c}).$ The latter observations have led us to conclude that the doping dependence of the superconducting gap is consistent with ${d}_{{x}^{2}ensuremath{-}{y}^{2}}$ symmetry, for slightly underdoped and overdoped crystals. Studies of the pair-breaking peak found in the ${B}_{1g}$ spectra demonstrate that the magnitude of the maximum gap $(|{ensuremath{Delta}}_{mathrm{max}}|)$ decreases monotonically with increasing hole doping, for $p>0.12.$ Based on the magnitude of the ${B}_{1g}$ renormalization, it is found that the number of quasiparticles participating in pairing increases monotonically with increased doping. On the other hand, the ${B}_{2g}$ spectra show a weak ``pair-breaking peak'' that follows a paraboliclike dependence on hole concentration, for $0.12<p<0.23.$" @default.
• W2281682913 created "2016-06-24" @default.
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• W2281682913 date "2002-08-12" @default.
• W2281682913 modified "2023-10-17" @default.
• W2281682913 title "Doping dependence of the superconducting gap in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CaCu</mml:mi></mml:mrow><mml:mrow><…" @default.
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• W2281682913 doi "https://doi.org/10.1103/physrevb.66.054516" @default.
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