Charge-density wave formation in Sr_{14}Cu_{24}O_{41}

Details Charge-density wave formation in Sr_{14}Cu_{24}O_{41} Charge-density wave formation in Sr_{14}Cu_{24}O_{41}

2002-01-23

arxiv.org/abs/cond-mat/0201413v2

Physics

Condensed Matter

Strongly Correlated Electrons

One name added to author list 4 pages, 2 figures, email: gorshunov@pi1.physik.uni-stuttgart.de

Scientific paper

10.1103/PhysRevB.66.060508

The electrodynamic response of the spin-ladder compound Sr$_{14-x}$Ca$_x$Cu$_{24}$O$_{41}$ ($x=0, 3, 9$) has been studied from radiofrequencies up to the infrared. At temperatures below 250 K a pronounced absorption peak appears around 12 cm$^{-1}$ in Sr$_{14}$Cu$_{24}$O$_{41}$ for the radiation polarized along the chains/ladders (${\bf E}\parallel {\bf c}$). In addition a strongly temperature dependent dielectric relaxation is observed in the kHz - MHz range. We explain this behavior by a charge density wave which develops in the ladders sub-system and produces a mode pinned at 12 cm$^{-1}$. With increasing Ca doping the mode shifts up in frequency and eventually disappears for $x=9$ because the dimensionality of the system crosses over from one to two dimensions, giving way to the superconducting ground state under pressure.

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