Charge density waves in Sr14-xCaxCu24O41: electron correlations vs. structural effects
K. -Y. Choi, M. Grove, P. Lemmens, M. Fischer, G. Güntherodt, U. Ammerahl, B. Büchner, G. Dhalenne, A. Revcolevschi, J. Akimitsu
Abstract
We report inelastic light scattering experiments in the spin-chain and ladder system Sr14-xCaxCu24O41. A depletion of an electronic background is observed for 0 < x < 5 at low temperatures and with light polarization both parallel to the leg and rung directions. This points to the formation of 2D charge density wave in the ladders. Furthermore, the Ca-substitution dependence of the 305- and 249-cm-1 modes, sensitive to the lattice modulations of the respective chain and ladder system, suggests that the charge dynamics in the ladders is strongly influenced by the structural incommensurability.
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