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- W1986048891 abstract "Single crystals of the optimally doped, moderately and strongly overdoped high-temperature superconductor ${mathrm{Tl}}_{2}{mathrm{Ba}}_{2}{mathrm{CuO}}_{6+ensuremath{delta}}$ (Tl-2201) with ${T}_{c}=80,$ 56, and 30 K, respectively, have been investigated by polarized Raman scattering. By taking the peak position of the ${B}_{1g}$ component of electronic Raman scattering as $2{ensuremath{Delta}}_{0}$ we found that the reduced gap value $(2{ensuremath{Delta}}_{0}{/k}_{B}{T}_{c})$ strongly decreases with increasing doping. The behavior of the low-frequency scattering for the ${B}_{1g}$ and ${B}_{2g}$ scattering components is similar for optimally doped and overdoped crystals and can be described by a ${ensuremath{omega}}^{3}$ and $ensuremath{omega}$ law, respectively, which is consistent with a d-wave symmetry of the order parameter. In contrast to the optimally doped Tl-2201 in both moderately and strongly overdoped Tl-2201, the relative (compared to the ${B}_{1g})$ intensity of the ${A}_{1g}$ scattering component is suppressed. We suggest that the van Hove singularity is responsible for the observed changes of Raman intensity and reduced gap value with doping. Electronic Raman scattering in the normal state is discussed in the context of the scattering from impurities and compared to the existing infrared data. The scattering rate evaluated from the Raman measurements is smaller for the overdoped samples, compared to the moderately overdoped samples." @default.
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- W1986048891 date "1998-11-01" @default.
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- W1986048891 title "Electronic Raman scattering in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Tl</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>Ba</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>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn><…" @default.
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- W1986048891 doi "https://doi.org/10.1103/physrevb.58.11753" @default.
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