Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-08-08
Phys. Rev. B 59, 1060 (1999)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, Revtex, 10 figures, Submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.59.1060
Neutron scattering experiments have been performed on Sr$_{14}$Cu$_{24}$O$_{41}$ which consists of both chains and ladders of copper ions. We observed that the magnetic excitations from the CuO$_2$ chain have two branches and that both branches are weakly dispersive along the $a$ and $c$ axes. The $\omega$-$Q$ 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 $J$=11 meV, interdimer coupling along the c axis $J_c$=0.75 meV, and interdimer coupling along the a axis $J_a$=0.75 meV. The dimer configuration indicates a quasi-two-dimensional hole ordering, resulting in an ordering of magnetic Cu$^{2+}$ 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.
Kakurai Kazuhisa
Matsuda Makoto
Shirane Gen
Yoshihama T.
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