A complete and exact solution of the ground-state problem for the Ising model on the Shastry-Sutherland lattice in an applied magnetic field is found. The magnetization plateau at one third of the saturation value is shown to be the only possible fractional plateau in this model. However, stripe magnetic structures with $1/2$ and $1/n$ ($n>3$) magnetization, observed in the rare-earth-metal tetraborides $R{\mathrm{B}}_4$, occur at the boundaries of the three-dimensional regions of the ground-state phase diagram. These structures give rise to new magnetization plateaus if interactions of longer range are taken into account. For instance, an additional third-neighbor interaction is shown to produce a $1/2$ plateau. The results obtained significantly refine the understanding of the magnetization process in $R{\mathrm{B}}_4$ compounds, especially in ${\mathrm{TmB}}_4$ and ${\mathrm{ErB}}_4$, which are strong Ising magnets.

• Received 22 April 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.167202