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Phys. Rev. B 66, 060508(R) (2002) [4 pages]

Charge-density wave formation in Sr14-xCaxCu24O41

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B. Gorshunov*, P. Haas, T. Rõõm†, and M. Dressel
1. Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany

T. Vuletić, B. Korin-Hamzić, and S. Tomić
Institute of Physics, Zagreb, Croatia

J. Akimitsu and T. Nagata‡
Department of Physics, Aoyama-Gakuin University, Tokyo, Japan

Received 22 January 2002; published 23 August 2002

The electrodynamic response of the spin-ladder compound Sr14-xCaxCu24O41(x=0,3,9) has been studied from radio frequencies up to the infrared. At temperatures below 250 K a pronounced absorption peak appears around 12cm-1 in Sr14Cu24O41 for the radiation polarized along the chains/ladders (E‖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 and produces a phason mode pinned at 12cm-1. With increasing x 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.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.66.060508
DOI:
10.1103/PhysRevB.66.060508
PACS:
74.72.Jt, 72.15.Nj, 74.25.Nf

*Permanent address: General Physics Institute, Russian Academy of Sciences, Moscow, Russia.

†Permanent address: National Institute of Chemical Physics and Biophysics, Tallinn, Estonia.

‡Present address: Faculty of Science, Ochanomizu University, Tokyo, Japan.

 
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