Abstract
We propose an electronic model for the recently discovered hole doped compound . From a multiband Hamiltonian with oxygen and nickel orbitals, a one band model is discussed. Holes are described using Zhang-Rice-like states at the nickels propagating on a spin chain. Using numerical techniques to calculate the dynamical spin structure factor in a realistic regime of couplings, spectral weight in the Haldane gap is observed in agreement with neutron scattering data. The case of static defects relevant for Zn-doped chains is also discussed. Ferromagnetic states at high hole mobility are favored in our model, contrary to what occurs in the 1D t-J model.
- Received 14 August 1995
DOI:https://doi.org/10.1103/PhysRevLett.76.1731
©1996 American Physical Society