Magnetization plateaux in the classical Shastry-Sutherland lattice

Details Magnetization plateaux in the classical Shastry-Sutherland lattice Magnetization plateaux in the classical Shastry-Sutherland lattice

2009-03-11

arxiv.org/abs/0903.1985v1

J. Phys.: Conf. Ser. 145, 012053 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, proceedings of HFM2008

Scientific paper

10.1088/1742-6596/145/1/012053

We investigated the classical Shastry-Sutherland lattice under an external magnetic field in order to understand the recently discovered magnetization plateaux in the rare-earth tetraborides compounds RB$_4$. A detailed study of the role of thermal fluctuations was carried out by mean of classical spin waves theory and Monte-Carlo simulations. Magnetization quasi-plateaux were observed at 1/3 of the saturation magnetization at non zero temperature. We showed that the existence of these quasi-plateaux is due to an entropic selection of a particular collinear state. We also obtained a phase diagram that shows the domains of existence of different spin configurations in the magnetic field versus temperature plane.

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