Charge density waves in Sr_14-xCa_xCu_24O_41: electron correlations vs. structural effects

Details Charge density waves in Sr_14-xCa_xCu_24O_41: electron correlations vs. structural effects Charge density waves in Sr_14-xCa_xCu_24O_41: electron correlations vs. structural effects

2006-01-10

arxiv.org/abs/cond-mat/0601203v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.73.104428

We report inelastic light scattering experiments in the spin-chain and ladder system Sr_14-xCa_xCu_24O_41. 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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