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Raman measurements in the 1.5 - 20 cm-1 energy range were performed on singlecrystals of Sr_{14-x}Ca_xCu_{24}O_{41}. A quasielastic scattering peak (QEP)which softens with cooling is observed in the polarization parallel to theladder direction for samples with x = 0, 8 and 12. The QEP is a Ramanfingerprint of pinned collective density wave excitations screened byuncondensed carriers. Our results suggest that transport in metallic samples,which is similar to transport in underdoped high-T_c cuprates, is driven by acollective electronic response.Comment: 4 pages, 3 figure

physical review letters

Collective Density-Wave Excitations in Two-Leg<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">S</mml:mi><mml:mi mathvariant="normal">r</mml:mi></mml:mrow><mml:mrow><mml:mn>14</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">a</mml:mi></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="…

Collective Density-Wave Excitations in Two-LegSr14−xCax