Quasi-two-dimensional hole ordering and dimerized state in the CuO2-chain layers in Sr14Cu24O41
arXiv:cond-mat/9808083 · doi:10.1103/PhysRevB.59.1060
Abstract
Neutron scattering experiments have been performed on SrCuO which consists of both chains and ladders of copper ions. We observed that the magnetic excitations from the CuO chain have two branches and that both branches are weakly dispersive along the and axes. The - dispersion relation as well as the intensities can be reasonably described by a random phase approximation with intradimer coupling between next-nearest-neighbor copper spins =11 meV, interdimer coupling along the c axis =0.75 meV, and interdimer coupling along the a axis =0.75 meV. The dimer configuration indicates a quasi-two-dimensional hole ordering, resulting in an ordering of magnetic Cu with spin-1/2 and nonmagnetic Cu, which forms the Zhang-Rice singlet. We have also studied the effect of Ca substitution for Sr on the dimer and the hole ordering.
7 pages, Revtex, 10 figures, Submitted to Phys. Rev. B
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