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Neutron scattering measurements have been performed on the S=1/2quasi-one-dimensional system Sr_{14-x}Y_{x}Cu_{24}O_{41}, which has both simplechains and two-leg ladders of copper ions. We observed that when a small amountof yttrium is substituted for strontium, which is expected to reduce the numberof holes, the dimerized state and the structure in the chain are changeddrastically. The inelastic peaks originating from the dimerized state of thechain becomes broader in energy but not in momentum space. This implies thatthe dimerized state becomes unstable but the spin correlations are unchangedwith yttrium substitution. Furthermore, it was observed that nuclear Bragg peakintensities originating from the chain show strong temperature and xdependence, which suggests that the chains slide along the c axis astemperature and x are varied.Comment: 5 pages, 6 figures, to appear in Phys. Rev.

physical review. b, condensed matter

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