Instability of isolated triplet excitations on the Shastry-Sutherland lattice (SSL)

Abstract

Configurations of singlets and triplets on the SSL have been proposed in the literature as variational ground states of the Shastry-Sutherland model at fixed magnetization M. We prove, that isolated triplet excitations on the SSL are unstable if the coupling alpha falls below a critical value alpha_c=2.0 (approx.). The instability should be visible in the compound SrCu_2(BO_3)_2 where a coupling alpha^*=1.48 is realized.

4 pages, 4 figures, RevTex

References in corpus (3)

• Magnetization plateaus of the Shastry-Sutherland model for SrCu_2(BO_3)_2: SDW, supersolid and bound states
• Soundwave Anomalies in SrCu_{2}(BO_{3})_{2}
• Magnetization Plateaus in the Shastry-Sutherland Model for SrCu_2(BO_3)_2: Results of Fourth-Order Perturbation Expansion with a Low-Density Approximation

Cited by in corpus (1)

• Possibility of superconductivity in the repulsive Hubbard model on the Shastry-Sutherland lattice