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Science 26 July 2002:
Vol. 297. no. 5581, pp. 584 - 587
DOI: 10.1126/science.1070481
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Reports

Sliding Density Wave in Sr14Cu24O41 Ladder Compounds

G. Blumberg,1* P. Littlewood,12 A. Gozar,1 B. S. Dennis,1 N. Motoyama,3 H. Eisaki,4 S. Uchida3

We used transport and Raman scattering measurements to identify the insulating state of self-doped spin 1/2 two-leg ladders of Sr14Cu24O41 as a weakly pinned, sliding density wave with nonlinear conductivity and a giant dielectric response that persists to remarkably high temperatures.

1 Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA.
2 University of Cambridge, Cavendish Laboratory, Cambridge CB3 0HE, UK.
3 University of Tokyo, Bunkyo-ku, Tokyo 113, Japan.
4 Stanford University, Stanford, CA 94305, USA.
*   To whom correspondence should be addressed. E-mail: girsh{at}bell-labs.com

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Science. ISSN 0036-8075 (print), 1095-9203 (online)