Exact bounds on the critical frustration in the Shastry-Sutherland Model
arXiv:cond-mat/0104385
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.
13 pages, 8 figures