Abstract
The standard Metropolis algorithm and the parallel tempering method are used to study the influence of the long-range RKKY interaction on the formation of magnetization plateaus in the 3D Ising model with magnetically coupled Shastry-Sutherland layers. It is shown that depending on the Fermi momentum kF the model exhibits the rich spectrum of magnetic solutions which is demonstrated by the appearance of the large number of magnetization plateaus on the magnetization curves. In particular, the following set of individual fractional magnetization plateaus with macroscopic stability regions is observed: m∕ms = 1/8, 1/7, 1/6, 1/5, 2/9, 1/4, 1/3, 3/8, 2/5, 5/12, 3/7, 1/2, 5/9 and 2/3. In the regime of kF ~ 2π∕1.24, corresponding to the real situation in TmB4, we have confirmed the existence of the magnetization plateau with m∕ms = 1∕8, the nature of which was intensively discussed in recent experimental works. Since the change of kF can be induced by doping, our results provide predictions of the complete sequences of magnetization plateaus that could appear in tetraboride solid solutions. And finally, the current results are confronted with our previous ones obtained for the two-dimensional Ising model with the RKKY interaction in order to reveal the role of system dimension on the formation of magnetization plateaus.
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Regeciová, L., Farkašovský, P. Formation of magnetization plateaus in the 3D Ising model with the long-range RKKY interaction: application to rare-earth tetraborides. Eur. Phys. J. B 93, 110 (2020). https://doi.org/10.1140/epjb/e2020-10123-5
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DOI: https://doi.org/10.1140/epjb/e2020-10123-5