title: Effective theory of magnetization plateaux in the Shastry-Sutherland lattice.
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 1/8, 1/4, 1/3 of the saturation, as found experimentally in a related compound. Moreover, other stable plateaux are found at 1/9, 1/6, or 2/9. We give a critical review of previous works and try to resolve some apparent inconsistencies between various theoretical approaches.
authors.affiliation: Laboratoire de Physique Théorique, Université de Toulouse, UPS, IRSAMC, F-31062 Toulouse, France.
authors.forename: A
authors.initials: A
authors.lastname: Abendschein
authors.forename: S
authors.initials: S
authors.lastname: Capponi