Dynamical properties of the spin-Peierls compound α'--NaV2O5

Details Dynamical properties of the spin-Peierls compound α'--NaV2O5 Dynamical properties of the spin-Peierls compound α'--NaV2O5

1997-04-02

arxiv.org/abs/cond-mat/9704015v3

Phys. Rev. B 56, R5732 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, latex, minor misprints corrected and a few references added

Scientific paper

10.1103/PhysRevB.56.R5732

Dynamical properties of the novel inorganic spin-Peierls compound \alpha'--NaV2O5 are investigated using a one-dimensional dimerized Heisenberg model. By exact diagonalizations of chains with up to 28 sites, supplemented by a finite-size scaling analysis, the dimerization parameter \delta is determined by requiring that the model reproduces the experimentally observed spin gap \Delta. The dynamical and static spin structure factors are calculated. As for CuGeO3, the existence of a low energy magnon branch separated from the continuum is predicted. The present calculations also suggest that a large magnetic Raman scattering intensity should appear above an energy threshold of 1.9 \Delta. The predicted photoemission spectrum is qualitatively similar to results for an undimerized chain due to the presence of sizable short-range antiferromagnetic correlations.

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