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

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

2002-04-22

arxiv.org/abs/cond-mat/0204465v1

Phys. Rev. B 65, 212406 (2002)

Physics

Condensed Matter

4 pages, 4 figures, RevTex

Scientific paper

10.1103/PhysRevB.65.212406

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.

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