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

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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.
4 pages, 3 figures

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Strongly Correlated Electrons, Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/144956

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0207219
 http://arxiv.org/abs/cond-mat/0207219
 Phys. Rev. Letters 91, 087401 (2003)
 doi:10.1103/PhysRevLett.91.087401

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arXiv