Spin-ordering in S = 1 anisotropic Heisenberg models with nondiagonal spin exchange

Details Spin-ordering in S = 1 anisotropic Heisenberg models with nondiagonal spin exchange Spin-ordering in S = 1 anisotropic Heisenberg models with nondiagonal spin exchange

1999-02-17

arxiv.org/abs/cond-mat/9902237v1

Eur. Phys. J. B 10, 465 (1999)

Physics

Condensed Matter

9 pages, 15 figures included, to appear in European Physical Journal B

Scientific paper

10.1007/s100510050875

The properties of S = 1 anisotropic Heisenberg models with nondiagonal exchange between axial and planar spin components are investigated using Monte Carlo techniques. The quantum nature is taken into account in a semi-classical approximation. The ordering of the spins when applying an external field with axial and planar components is discussed. It is argued that the quantum nature of the spins and the nondiagonal exchange may explain the peculiar shape of the magnetic specific heat of FeBr2 as well as the weakly first-order phase transition observed in the same compound when a tilted field is applied.

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