Spin dynamics of hole doped Y2BaNiO5

Details Spin dynamics of hole doped Y2BaNiO5 Spin dynamics of hole doped Y2BaNiO5

1998-10-28

arxiv.org/abs/cond-mat/9810387v1

Europhys. Lett., 43 (1), pp. 71-76 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1209/epl/i1998-00321-x

Starting from a multiband Hamiltonian containing the relevant Ni and O orbitals, we derive an effective Hamiltonian $H_{eff}$ for the low energy physics of doped Y$_{2}$BaNiO$_{5}.$ For hole doping, $H_{eff}$ describes O fermions interacting with S=1 Ni spins in a chain, and cannot be further reduced to a simple one-band model. Using numerical techniques, we obtain a dynamical spin structure factor with weight inside the Haldane gap. The nature of these low-energy excitations is identified and the emerging physical picture is consistent with most of the experimental information in Y% $_{2-x}$Ca$_{x}$BaNiO$_{5}$

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