Collective density-wave excitations in two-leg Sr14-xCaxCu24O41 ladders.
Collective density-wave excitations in two-leg Sr14-xCaxCu24O41 ladders.
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DOI：
10.1103/physrevlett.91.087401
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发表时间：
2002-07
影响因子：
8.6
通讯作者：
A. Gozar;G. Blumberg;P. Littlewood;B. Dennis;N. Motoyama;H. Eisaki;S. Uchida
中科院分区：
文献类型：
--
作者：
A. Gozar;G. Blumberg;P. Littlewood;B. Dennis;N. Motoyama;H. Eisaki;S. Uchida
Raman measurements in the 1.5-20 cm(-1) energy range were performed on single crystals of Sr14-xCaxCu24O41. A quasielastic scattering peak (QEP) which softens with cooling is observed only 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 in the ladder structures. 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.
