Abstract
We use the nonperturbative Contractor-Renormalization method (CORE) in order to derive an effective model for triplet excitations on the Shastry-Sutherland lattice. For strong enough magnetic fields, various magnetization plateaux are observed, e.g., at , , of the saturation, as found experimentally in a related compound. Moreover, other stable plateaux are found at , , or . We give a critical review of previous works and try to resolve some apparent inconsistencies between various theoretical approaches.
- Received 7 July 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.227201
©2008 American Physical Society