The Phase Diagram of the Shastry-Sutherland Antiferromagnet
Weihong, Zheng · Oitmaa, J. · Hamer, C. J.
Original · EN
The Shastry-Sutherland model, which provides a representation of the magnetic properties of SrCu₂(BO₃)₂, has been studied by series expansion methods at T=0. Our results support the existence of an intermediate phase between the Néel long-range ordered phase and the short-range dimer phase. They provide strong evidence against the existence of helical order in the intermediate phase, and and somewhat less strong evidence against a plaquette-singlet phase. The nature of the intermediate phase thus remains elusive. It appears to be gapless, or nearly so.
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