Low-Lying Magnetic Excitation of the Shastry-Sutherland Model

Details Low-Lying Magnetic Excitation of the Shastry-Sutherland Model Low-Lying Magnetic Excitation of the Shastry-Sutherland Model

2001-01-10

arxiv.org/abs/cond-mat/0101125v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 6 figures combined into 1 PSfile. Final version to appear in Phys.Rev.Lett. (Jan. 2000)

Scientific paper

10.1103/PhysRevLett.86.520

By using perturbation calculation and numerical diagonalization, low-energy spin dynamics of the Shastry-Sutherland model is investigated paying particular attention to the two-particle coherent motion. In addition to spin-singlet- and triplet bound states, we find novel branches of coherent motion of a bound quintet pair, which are usually unstable because of repulsion. Unusual dispersion observed in neutron-scattering measurements are explained by the present theory. The importance of the effects of phonon is also pointed out.

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