Phys. Rev. Lett. 76, 1731–1734 (1996)Spin Dynamics of Hole Doped Y2-xCaxBaNiO5Received 14 August 1995; published in the issue dated 4 March 1996 We propose an electronic model for the recently discovered hole doped compound Y2-xCaxBaNiO5. From a multiband Hamiltonian with oxygen and nickel orbitals, a one band model is discussed. Holes are described using Zhang-Rice-like S = 1/2 states at the nickels propagating on a S = 1 spin chain. Using numerical techniques to calculate the dynamical spin structure factor S(q,ω) 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. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.1731
DOI:
10.1103/PhysRevLett.76.1731
PACS:
75.25.+z, 75.10.Jm, 75.50.Ee
See AlsoComment: C. D. Batista, A. A. Aligia, and J. Eroles, Low-Energy Physics of Hole Doped Y2BaNiO5, Phys. Rev. Lett. 81, 4027 (1998). Reply: Elbio Dagotto and José Riera, Dagotto and Riera Reply:, Phys. Rev. Lett. 81, 4028 (1998). |
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