Magnetization plateaux in an extended Shastry-Sutherland model

Details Magnetization plateaux in an extended Shastry-Sutherland model Magnetization plateaux in an extended Shastry-Sutherland model

2008-10-09

arxiv.org/abs/0810.1596v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, Proceedings of the HFM2008 Conference

Scientific paper

10.1088/1742-6596/145/1/012047

We study an extended two-dimensional Shastry-Sutherland model in a magnetic field where besides the usual Heisenberg exchanges of the Shastry-Sutherland model two additional SU(2) invariant couplings are included. Perturbative continous unitary transformations are used to determine the leading order effects of the additional couplings on the pure hopping and on the long-range interactions between the triplons which are the most relevant terms for small magnetization. We then compare the energy of various magnetization plateaux in the classical limit and we discuss the implications for the two-dimensional quantum magnet SrCu$_2$(BO$_3$)$_2$.

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