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Collective density wave excitations in two-leg Sr_{14-x}Ca_xCu_{24}O_{41} ladders

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arxiv cond-mat/0207219 v1 pith:43T3T3WH submitted 2002-07-09 cond-mat.str-el cond-mat.supr-con

A. Gozar , G. Blumberg , P. B. Littlewood , B.S. Dennis , N. Motoyama , H. Eisaki , S. Uchida This is my paper
classification cond-mat.str-elcond-mat.supr-con
keywords collectivedensityexcitationsramansamplestransportwavecarriers
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Raman measurements in the 1.5 - 20 cm-1 energy range were performed on single crystals 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 the ladder direction for samples with x = 0, 8 and 12. The QEP is a Raman fingerprint of pinned collective density wave excitations screened by uncondensed carriers. Our results suggest that transport in metallic samples, which is similar to transport in underdoped high-T_c cuprates, is driven by a collective electronic response.

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