Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-09-18
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 6 figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.56.14499
Neutron scattering measurements have been performed on the S=1/2 quasi-one-dimensional system Sr_{14-x}Y_{x}Cu_{24}O_{41}, which has both simple chains and two-leg ladders of copper ions. We observed that when a small amount of yttrium is substituted for strontium, which is expected to reduce the number of holes, the dimerized state and the structure in the chain are changed drastically. The inelastic peaks originating from the dimerized state of the chain becomes broader in energy but not in momentum space. This implies that the dimerized state becomes unstable but the spin correlations are unchanged with yttrium substitution. Furthermore, it was observed that nuclear Bragg peak intensities originating from the chain show strong temperature and x dependence, which suggests that the chains slide along the c axis as temperature and x are varied.
Eisaki Hiroshi
Katsumata Katsurou
Matsuda Makoto
Motoyama Naoki
Osafune Tatsuaki
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