The two-dimensional frustrated Heisenberg model on the orthorhombic lattice

Details The two-dimensional frustrated Heisenberg model on the orthorhombic lattice The two-dimensional frustrated Heisenberg model on the orthorhombic lattice

2009-08-24

arxiv.org/abs/0908.3442v1

B Schmidt et al 2010 J. Phys.: Conf. Ser. 200 022055

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, accepted for publication in Journal of Physics: Conference Series

Scientific paper

10.1088/1742-6596/200/2/022055

We discuss new high-field magnetization data recently obtained by Tsirlin et al. for layered vanadium phosphates in the framework of the square-lattice model. Our predictions for the saturation fields compare exceptionally well to the experimental findings, and the strong bending of the curves below saturation agrees very well with the experimental field dependence. Furthermore we discuss the remarkably good agreement of the frustrated Heisenberg model on the square lattice in spite of the fact that the compounds described with this model actually have a lower crystallographic symmetry. We present results from our calculations on the thermodynamics of the model on the orthorhombic (i.e., rectangular) lattice, in particular the temperature dependence of the magnetic susceptibility. This analysis also sheds light on the discussion of magnetic frustration and anisotropy of a class of iron pnictide parent compounds, where several alternative suggestions for the magnetic exchange models were proposed.

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