Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-10-21
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 6 figures
Scientific paper
We study magnetic properties of the $S=1/2$ Ising-like XXZ model on the Shastry-Sutherland lattices with long-range interactions, using the quantum Monte Carlo method. This model shows magnetization plateau phases at one-half and one-third of the saturation magnetization when additional couplings are considered. We investigate the finite temperature transition to one-half and one-third plateau phases. The obtained results suggest that the former case is of the first order and the latter case is of the second order. We also find that the system undergoes two successive transitions with the 2D Ising model universality, although there is a single phase transition in the Ising limit case. Finally, we estimate the coupling ratio to explain the magnetization process observed in ${\rm TmB_4}$
Kawashima Naoki
Suzuki Takahumi
Tomita Yusuke
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