Abstract
The antiferromagnetic structure found in FeI 2 is investigated theoretically. In order to explain the ordered spin structure, the intraplane exchange interactions in a hexagonal layer J 1 , J 2 and J 3 , and the interplane exchange interactions J ' 1 , J ' 2 between adjacent layers and J '' 1 between second nearest layers have been taken into account, and the following conditions among them are derived; J 2 0, J 1 -2 J 2 | J ' 1 -2 J ' 2 |. It is pointed out that the ground states are quadruply degenerate including the FeI 2 -structure and the degeneracy cannot be removed by any magnetic interactions. Discussion on this degeneracy and comparison with experiments to estimate the exchange constants are also made.
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