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Theory of Magnetization Plateaux in the Shastry-Sutherland Model

2008; American Physical Society; Volume: 101; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.101.250402

1092-0145

Julien Dorier, Kai Phillip Schmidt, Frédéric Mila,

Magnetic and transport properties of perovskites and related materials

Motivated by the remarkable properties of SrCu2(BO3) 2 in a magnetic field, we use perturbative continuous unitary transformations to determine the magnetization plateaux of the Shastry-Sutherland model, unveiling an unexpected sequence of plateaux progressively appearing at 2/9, 1/6, 1/9, and 2/15 upon increasing the interdimer coupling. We predict that a 1/6 plateau should be present in SrCu2(BO3)2, even if residual interactions beyond the Shastry-Sutherland are strong enough to modify the other plateaux below 1/3. The method is extended to calculate the magnetization profile within the plateaux, leading to a local structure around triplons that agrees with NMR results on SrCu2(BO3) 2.