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

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

2002-07-09

arxiv.org/abs/cond-mat/0207219v1

Phys. Rev. Letters 91, 087401 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.91.087401

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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