Exact bounds on the critical frustration in the Shastry-Sutherland Model
Ute Löw, Erwin Müller-Hartmann
Abstract
We discuss the phase diagram of the Shastry-Sutherland model for arbitrary spin S and derive rigorous lower and upper bounds on the phase boundaries of the dimer phase by using various versions of a variational ansatz in combination with the exact diagonalisation method.
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