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Magnetization Plateaus in Generalized Shastry-Sutherland Models
Keola Wierschem,Pinaki Sengupta 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We study an anisotropic Heisenberg antiferromagnet with ferromagnetic transverse spin exchangeusing exact quantum Monte Carlo methods. Such a model is relevant to a class of rare earthtetraboride materials that display a range of magnetization plateaus under applied magnetic field. The layered arrangement of magnetic ions in these materials is topologically equivalent to theShastry-Sutherland lattice. In this frustrated geometry, we study the interplay of next-nearestneighbor interactions in stabilizing a plateau at half the saturation magnetization (or 1/2 plateau). We also show hysteresis-like behavior at the onset of the 1/3 plateau.