The two-dimensional frustrated Heisenberg model on the orthorhombic lattice

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...

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Bibliographic Details
Published in:Journal of physics. Conference series 2010-01, Vol.200 (2), p.022055
Main Authors: Schmidt, B, Siahatgar, M, Thalmeier, P, Tsirlin, A A
Format: Article
Language:English
Subjects:
Anisotropy
Bend strength
Crystallography
Group 5A compounds
Heisenberg theory
Magnetic permeability
Orthorhombic lattice
Phosphates
Physics
Saturation
Statistical models
Temperature dependence
Two dimensional models
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Summary: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.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/200/2/022055